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Advanced Math/Questions Answered by Expert Sherry Wallin
| Subject | Date Asked |
| Math | 1/24/2012 |
| Q: Suppose that a market research company finds that at a price of p = $23, they would sell x = 39 ... A: There are a lot of different ways to determine the demand equation. The first thing you need to ... | |
| math | 1/23/2012 |
| Q: Observe the sequence 1,1,2,3,5,8,13,.....Starting from the third number, each number is the sum of ... A: Leonard~ Hopefully you recognize this as the Fibonacci Sequence. There is a lot of information out ... | |
| Differentiation | 1/21/2012 |
| Q: i have 3 questions, and am trying to see if i have some correct, A(i) write the derivative of the ... A: I will show you how to do the first two. You have not shown me what your answers are or how you did ... | |
| Can you please help me with this word problem | 1/15/2012 |
| Q: Given the length and width (in feet and inches) of a rectangular room and the price per square yard ... A: Is this a linear programming problem? I will help you by listing what you will need to do and you ... | |
| Savings for baby. | 1/8/2012 |
| Q: My wife and I would like to save an Extra $10,000 by November 2012. Currently I am the only that ... A: J Conceivably you could save $16388 by the time November rolls around. I figure there are 21 ... | |
| Please Help me | 12/29/2011 |
| Q: Q1) what is the value of 3333-333+3? Options are : A)1000,B)2000,C)3222,D)3122. Q2)2/5 0f of a ... A: your choices do not have the correct values in them. For example for the first one: 3333-333+3 = ... | |
| subject of formula | 12/16/2011 |
| Q: From the formula for the sum of a geometric progression(GP). S= a(r^n - 1)/r - 1 make "r" the ... A: I'm not 100% certain what you are trying to do. If what you are trying to do is solve for r it ... | |
| probability | 12/14/2011 |
| Q: Drawing 3 cards from a 52 card deck, what is the probability/odd of: a)them all being red b) one of ... A: a) 4/52 * 3/51 * 48/50 = .0043433891 with the same reasoning as before. The first factor 4/52 is ... | |
| probability | 12/13/2011 |
| Q: Drawing 3 cards from a 52 card deck, what is the probability/odd of: a)them all being red b) one of ... A: There are 26 red cards out of 52 cards, so the probability of choosing one red is 26/52 = 1/2 After ... | |
| maths | 12/7/2011 |
| Q: (a^1)+(a^2)+...+(a^n) how 2 solve this for a=3 and n=8 A: I am not sure what the question is, except that you will want to figure out what 3 + 3^2 + 3^3 ... | |
| Pre-Algebra | 11/30/2011 |
| Q: how do you solve this problem i don't get how you do it?! 8x+10=2x-8 A: Hailey~ 8x + 10 = 2x - 8 first you want to gather your terms with x on one side so lets -2x from ... | |
| Trig | 11/27/2011 |
| Q: Find all the exact solutions (in radians) for the equation 3tan^2 alpha - 4 = tan alpha. A: Joe~ Substitute tan alpha with x, move everything to the left and get: 3x^2 - x - 4 = 0 now factor ... | |
| Equation? | 11/21/2011 |
| Q: I’m looking to figure out an equation that can forecast sales. For example let’s say I have sales ... A: Tom~ There are a lot of things that will affect sales but in general if you have data for the ... | |
| Equation? | 11/17/2011 |
| Q: I’m looking to figure out an equation that can forecast sales. For example let’s say I have sales ... A: Tom~ Is this a statistics problem? When you say with a certain level of confidence it smacks of ... | |
| word problem | 11/16/2011 |
| Q: Julio left the hospital and drove toward the recycling plant at an average speed of 55 mph. Jasmine ... A: Jessi~ Let t = Jasmine's time driving and Julio's time is t + 4. The distances are the same and we ... | |
| mathematics | 11/14/2011 |
| Q: sir how can we solve 2^x+x-3=0,and that type of questions ,please give me the method . ANSWER: ... A: There are many ways to try to bound the problem but I do not know your level of math. Have you had ... | |
| Advance Algebra | 11/13/2011 |
| Q: 1.) Suppose an old peso bill is 20 cm long and 12 cm wide. It is mounted on a piece of cardboard ... A: Hazel~ The area of the peso bill is 20(12) = 240 square cm you want a cardboard 2 3/4 in area ... | |
| math | 11/7/2011 |
| Q: in the 2004 season, seattle's lauren jackson was ranked first in the wnba for total points and ... A: Noel~ Let x = number of 3 pt field goals Let y = number of 2 pt field goals Let z = number of free ... | |
| pre cal | 11/2/2011 |
| Q: write an equation of the sine function with amplitude 4, period 3 degrees, and phase shift of -30 ... A: If f(x) = Asin(Bx+C) A = amplitude 2*pi/|B|= period assuming B>0, -C/B is the phase shift note - 30 ... | |
| multiplication | 10/31/2011 |
| Q: if f(x)=x1.x2.x3 and f(y)=y1.y2.y3 and y1=x1+dx1, y2=x2+dx2, y3=x3+dx3 then, f(x)-f(y) is not equal ... A: You can take what I did earlier then and in place of the dxn but xn'. I'm not sure what you are ... | |
| Calculus | 10/30/2011 |
| Q: Good Afternoon Sherry, Could you explain me how to find parametric equation and implicit ... A: Rishi~ If the radius is on the x-axis then the base of the right circular cone is in the xy plane ... | |
| multiplication | 10/30/2011 |
| Q: if f(x)=x1.x2.x3 and f(y)=y1.y2.y3 and y1=x1+dx1, y2=x2+dx2, y3=x3+dx3 then, f(x)-f(y) is not equal ... A: f(x)-f(y) =x1x2x3-(x1x2x3+x1x3dx2+x2x3dx1+x3dx1dx2+x1x2dx3+x1dx2dx3+x2dx1dx3+dx1dx2dx3) = ... | |
| Pythagoras Theoram | 10/26/2011 |
| Q: Sir , I have got an assignment , which i have fully done , excluding the question given below , ... A: Ashar~ Hi, here is a method for answering your question using the Pythagorean Theorem, however you ... | |
| Scrabble Board Game - Reinventing - Maths Application. | 10/21/2011 |
| Q: http://en.wikipedia.org/wiki/Scrabble Current Board Design ------------------------ 15*15 square ... A: what an interesting thing to ponder. I am sure the answer is yes to your last question, that is, ... | |
| Price is Right-Math question | 10/20/2011 |
| Q: To Miss Wallin: This question happens on popular game show sometimes-"The Price is Right." ... A: Timothy it would help me if you were to tell/show me what techniques you used to arrive at your ... | |
| Savings. | 10/17/2011 |
| Q: Rent 800 Food 240 Electricity 100 Gas bottles 100 Petrol 300 Luxury weekend cafes’…etc approx. 200 ... A: a fortnight is 2 weeks or 14 days and you said your wife makes $2640 in a fortnight which means she ... | |
| Graph Interpretation probability and percentile | 10/12/2011 |
| Q: I was trying to understand the following portion of an article, which stated: A) "... the ... A: J~ Your interpretation of the first graph is accurate except the probability approached a maximum ... | |
| input output | 10/10/2011 |
| Q: I need an equation for the following input output statement. S 18 20 22 24 ? ? ? T 9 11 13 15 17 ... A: Samantha~ Let T be the dependent variable, and S the independent variable. Find the slope m = ... | |
| VECTOR | 10/6/2011 |
| Q: the point A{x1,y1,z1}and B{x2,y2,z2}lie in the plane ax+by+cz=d.Show that a{x2-x1}+b{y2-y1}+c ... A: Sorry for the late response... Substitute the point A into ax+by+cx = d: ax1 + by1 + cz1 = d and ... | |
| Savings. | 10/5/2011 |
| Q: Rent 800 Food 240 Electricity 100 Gas bottles 100 Petrol 300 Luxury weekend cafes’…etc approx. 200 ... A: This new info makes no sense. In 4 months there are approx 17-18 weeks and suppose it is 18 then ... | |
| Savings. | 10/4/2011 |
| Q: Rent 800 Food 240 Electricity 100 Gas bottles 100 Petrol 300 Luxury weekend cafes’…etc approx. 200 ... A: A. 800 + 240 + 100 + 100 + 300 + 200 = 1740 in debt monthly with 2600(2) + 4000 = 9200 monthly ... | |
| Missing ) need help with math. | 10/3/2011 |
| Q: Sorry before I was missing a ) in the first example. I am trying to work out the part in brackets ... A: A~ Are you using x as a variable in both instances? I suspect not. You can't use x as an operator ... | |
| COMPLEX VARIABLE | 9/30/2011 |
| Q: please help me out with the following question please please.... I am waiting for the answer Using ... A: Attir~ w = 1/z^2 lim [f(z+h) - f(z)]/h = lim [1/(z+h)^2 - 1/z^2]/h => lim ... | |
| Prime Factorization | 9/26/2011 |
| Q: Hey Sherry i hope you don't mind me asking this ok well here it is... Cameron is making bead ... A: Jonathan~ You will want to find the GCF of 90 and 108. One way to do it is to prime factor each ... | |
| number theory | 9/24/2011 |
| Q: question is in the image @@@@@IMAGE:87355:Advanced-Math-1363/2011/09/number-theory_3.jpg##### ... A: 3 to the 33rd power is the same as 3 cubed all to the 11th power. 3 cubes is 3*3*3 = 27. You are ... | |
| determinants | 9/24/2011 |
| Q: question is in the image @@@@@IMAGE:87351:Advanced-Math-1363/2011/09/determinant_2.jpg##### ANSWER: ... A: If you have a 2x2 matrix and you want to find the determinant you multiply the element in the 1st ... | |
| determinants | 9/23/2011 |
| Q: question is in the image A: | 1 5 8 | x | 0 2 6 | | 0 0 3 | Since there are three zeros in the first column of 4 all ... | |
| Card Indoor Game - Reinventing - Maths Application | 9/20/2011 |
| Q: Can we manufacture/create another 13 Cards for say Lotus, 13 Cards for Daffodil, 13 Cards for ... A: I am not a bridge player. However think about what you say in #'s 1,2,3. Of course they are not ... | |
| maths | 9/20/2011 |
| Q: IQGiven that there are 10 bottles(1 bottle antidote, 9 bottles poison) of pills in the lab. Each ... A: Well one way to determine which bottle is the anecdote is to see which bottle doesn't poison/kill ... | |
| Mathematical Keyboard Software Interface | 9/16/2011 |
| Q: Can we have a Mathematical Keyboard Layout Software Interface ? The Designed Mathematical Keyboard ... A: I think your ideas are great but I think we have been talking two different applications. What i was ... | |
| Pay to go to perm. | 9/15/2011 |
| Q: I am presently contracting my pay after tax (rate of 30%) per week is $1787.48. Now if I go ... A: Let x = the amount of gross pay then .30x is the tax on the gross pay and you want a net of 1787.48 ... | |
| problem sets/ proportional reasoning | 9/14/2011 |
| Q: 1. The gauge of an oil tank indicated that it was 1/7 full. After 240 gallons were added, the gauge ... A: michaelyn~ basically you have a tank that is 1/7 full and when you put some fuel in, exactly 240 ... | |
| Mathematical Keyboard Software Interface | 9/12/2011 |
| Q: Can we have a Mathematical Keyboard Layout Software Interface ? The Designed Mathematical Keyboard ... A: Absolutely. You can assign special symbols for your keyboard keys even now in Microsoft Word without ... | |
| inequality | 9/11/2011 |
| Q: the question is attached as gif file A: Pedja~ Try using mathematical induction. Math Prof | |
| Simplify Fraction | 9/11/2011 |
| Q: How would you go about simplifying this: 1 + 2n 2n ------ x ------ −2n 1 ... A: Daniel~ Cancel the 2n with the 2n leaving you with (1+2n)/-1(1-2n) = (2n+1)/(2n-1) All I did above ... | |
| Direct and Inverse Variation | 9/10/2011 |
| Q: DIRECT VARIATION : one quantity increases the other quantity increases or if one quantity decreases ... A: Direct proportion and direct variation would mean the same thing in this context. You asked what ... | |
| Direct and Inverse Variation | 9/9/2011 |
| Q: DIRECT VARIATION : one quantity increases the other quantity increases or if one quantity decreases ... A: Variations involve a constant k. y = kx means y varies directly as x. y = k/x means y varies ... | |
| Trigonometry | 8/21/2011 |
| Q: I have a worksheet for homework and out of 7 I don't get these two. Please help, thanks Verify the ... A: Merlene~ Since the cos^2(x) + sin^2(x) = 1, then solving for sin^2(x) you get that cos^2(x) = 1 - ... | |
| Mathematical and Physical Constants | 8/18/2011 |
| Q: Referring to the Wikipedia Link for Mathematical Constants ... A: Prashant~ I do not know where you got the definition: "Those Physical constants whose value do not ... | |
| Mathematical and Physical Constants | 8/17/2011 |
| Q: Referring to the Wikipedia Link for Mathematical Constants ... A: A physical constant on earth for gravity will not be a mathematical constant because you need to ... | |
| Simultaneous Equations | 8/16/2011 |
| Q: I have the following four equations, and need to solve for the four unknowns. Reduced row echelon ... A: Kane~ You can't find a solution for the 4 unknowns because this is a dependent system. Row 2 and ... | |
| Maths-TRIGNOMETRIC FUCTIONS OF MULTIPLE ANGLE | 8/8/2011 |
| Q: Prove that sin16x/sinx=16cosx.cos2x.cos4x.cos8x A: Sorry for the delay in answering I have been on vacation in the mountains with no internet access... ... | |
| Maths-trgnometric ration of allied angles | 8/4/2011 |
| Q: Prove that Sin(pi/5)+sin (4pi/5)-sin(11pi/15)-sin(14pi/15)=0 A: Dhananjay~ Not sure what there is to prove, you can put this into a calculator and verify it or ... | |
| Maths-Trignometry | 8/4/2011 |
| Q: Prove that cos(90+x)sec(270+x)sin(180+x)/(cos(-x)cos(270-x)tan(180+x)=cosx A: Dhananjay~ You will never be able to prove this because it is not true. Always, always check if you ... | |
| Matrix | 7/30/2011 |
| Q: If Matrix A = 1 0 1 then show that |3A| = 27 |A| 0 1 2 0 ... A: det 3A = |3 0 3| = 3|3 6| = 3(3(12) - 0(6)) = 3(36) = 108 |0 3 ... | |
| probabilities and permutations | 7/28/2011 |
| Q: just wanna ask some questions, that my head really hurts everytime i try to compute the ... A: Sanny~ What is ff? 1 - the probability of getting a pair of cards in a standard deck of cards. ... | |
| math | 7/27/2011 |
| Q: Let L be the set of all lines n a plane and R be the relation defined as R = {(m,n)εLxL/m is ... A: You will need to send the problem where it can be properly determined. The way it comes across it ... | |
| Reflective Character Series - (Exact Replica of the Character/Letter/Alphabet in Mirror) | 7/27/2011 |
| Q: As similar to Reflective Number Series. we can also note down the Reflective character series for ... A: If the letters you stated are all those that were not in the reflective set, then yes the 2nd set ... | |
| math | 7/26/2011 |
| Q: Let L be the set of all lines n a plane and R be the relation defined as R = {(m,n)εLxL/m is ... A: To be reflexive the lines need to be the same and two perpendicular lines are obviously not the ... | |
| * Mirrored Numbers - (Exact Replica of the Number) - Optics & Real Life Use ? | 7/26/2011 |
| Q: What i observe by looking at the Numeric Whole Numbers(Integers) in Mirror (Glass) Object are the ... A: If you can figure out a formula or a pattern that generates the series then it would be. The ... | |
| Right Triangle | 7/22/2011 |
| Q: If you have a right triangle as shown in the graph below, I guess it is possible to calculate the ... A: Nelaw~ If you know x1,x2,y1,y2 you can find the distance between the two ordered pairs (x1,y1) and ... | |
| Right Triangle | 7/19/2011 |
| Q: If you have a right triangle as shown in the graph below, I guess it is possible to calculate the ... A: Nelaw~ You can find the distance between two points and that will give you the length of the ... | |
| combinations | 7/17/2011 |
| Q: how many combinations are there if you have two groups of numbers.1-50 then also 1-11 A: Combinations imply that 1,2 is no different than 2,1 or abc is no different than cab etc, exact ... | |
| Radicals (Surd) | 7/16/2011 |
| Q: {(7*3^1/2)/ (10^1/2+3^1/2)} – {(2*5^1/2)/ (6^1/2+5^1/2)} – {(3*2^1/2)/ (15^1/2+ [3*2^1/2])} A: Sri~ Multiply each term by the conjugate of it's denominator. For example the first term's ... | |
| Matrix Multiplication | 7/14/2011 |
| Q: When we are multiplying two matrices, it is necessary that the number of columns of the matrix to ... A: it is necessary that the number of columns of the matrix to the left should be equal to the number ... | |
| Maths-Trignometric ratios | 7/14/2011 |
| Q: If x=asinx+bcosx, y=acosx-bsinx, Then show that (ax+by)^2+(bx+ay)^2=(a^2+b^2)^2 A: Dhananjay~ I think you must have a typo because I do not believe this is true the way you have it. ... | |
| MAT 150 | 7/12/2011 |
| Q: I've been trying to do this question all night, so I need some help. Here it goes: The weight of a ... A: Ok, well then you need to just use the formula for the varies jointly and that is if y varies ... | |
| Maths-Trignometric functions | 7/11/2011 |
| Q: Prove that [cos(Theta)/(1-tan(theta)]+[sin (theta)/1-cot(theta)]=Sin(theta)+cos(theta) A: Dhananjay~ Let's call theta x so that we have: [cos x/(1-tan x]+[sin x/1-cot x]=sin x+cos x [cos ... | |
| Hours of work. | 7/6/2011 |
| Q: would just like to know how many hours I've worked this week, can you please let me know, they are ... A: A~ 8.25 + 8.75 + 8.5 + 8 + 8 = 41.5 Convert 5.15 to 1715 and 1715 - 9 = 815 convert 5 to 1700 ... | |
| Permutation and combination | 7/6/2011 |
| Q: I've tried to solve this problem but I can't. Please help me. *How many mixed double tennis teams ... A: This is just a multiplication principal counting problem. If there are m1 ways to choose something ... | |
| advanced math | 6/30/2011 |
| Q: if 2x^3+Mx^2+Nx+6 is divisible ny both x-1 & x+2 , find M & N. A: Jasmin~ Do you know how to do synthetic division? If both x-1 and x+2 divide your polynomial that ... | |
| general equation of circle(problem) | 6/29/2011 |
| Q: i m not getting the answer of following question "find the equation of a circle passing through ... A: Samiksha~ There are many forms of equations for circles, the most common is (x-h)^2 + (y-k)^2 = ... | |
| Normal Distribution Curve | 6/22/2011 |
| Q: The mean = 32.3 and standard deviation of the data is:6.3 ---> Calculate the percent of sales, to ... A: There is a rule called the "Empirical Rule" for normal distributions or bell-shaped distributions ... | |
| Depreciation | 6/22/2011 |
| Q: The price of a ;arge piece of construction equipment purhcased by Hass Construction Company was ... A: Darrell~ The first thing you need to calculate is the total cost which will be the price of the ... | |
| MATRICES USING MATLAB | 6/21/2011 |
| Q: i need some step by step method solving these as i havent come across these before, i normally use ... A: First you need to enter the matrix and then give it the command solve. You will want to name your ... | |
| Probability | 6/21/2011 |
| Q: Sherry, How are you? I am unable to solve the following problems, can you please help me? --> ... A: Andrea~ The probability of obtaining a head when tossing afair coin is 1/2 and the probability of ... | |
| MATRICES USING MATLAB | 6/17/2011 |
| Q: i need some step by step method solving these as i havent come across these before, i normally use ... A: John~ We can do this problem by hand using matrices. For every variable in each row we put the ... | |
| SUSPENSION BRIDGES | 6/16/2011 |
| Q: The curve described by the cable of the suspension bridge is given by y=3hx^3/2L^2-(h/L)x+4h, where ... A: DP~ Yep the "=" is a typo and should be a "+". The final answer is in terms of the constants h and ... | |
| SUSPENSION BRIDGES | 6/15/2011 |
| Q: The curve described by the cable of the suspension bridge is given by y=3hx^3/2L^2-(h/L)x+4h, where ... A: DP~ There are 3 basics curves that you get for a conic section depending on how you cut/slice ... | |
| Maths Question needing help | 6/15/2011 |
| Q: what is the largest possible value of n (n is an odd number) if n consecutive positive numbers are ... A: I had to read this problem more carefully. You need to be clearer. Is it n consecutive positive ... | |
| Functions | 6/14/2011 |
| Q: Find the next 3 terms of the following sequence and write the recursive formula. 7, 10, 17, 27, 44, ... A: What I do is look for a pattern, that is a relationship that fits all the numbers given. What I saw ... | |
| Solving for Exponent Value | 6/11/2011 |
| Q: Trying to solve the following: (Solve for y) 101.6 = 6e^[(-o.10469)(0.5)]+ 6e^[(-0.10536)]+ ... A: Chris~ Your first two steps are fine. You make your fatal error when you don't divide both sides by ... | |
| What Should I Know? | 6/11/2011 |
| Q: I am getting ready to go to the 11th grade this coming school year and am taking AP English, ... A: I can help you with what you will need to know for Trigonometry and Algebra 3, but you will need to ... | |
| Parabola known focus and two points | 6/10/2011 |
| Q: I am designing a parabolic solar reflecting panel. I know two points and the focus, how can I ... A: It is not clear to me what information you really have. I understand in this particular instance ... | |
| Burnside's Counting Theorem | 6/10/2011 |
| Q: I'm in the final week of this abstract algebra class and am stuck again, so I'm hoping you can ... A: I don't think your example warrants Burnside's Theorem because the answer to your problem is really ... | |
| Functions | 6/9/2011 |
| Q: Suppose a bike wheel has a diameter of 70 cm and the rider completes one cycle in 0.8 s. What is ... A: Kerry~ What units are you to report your answer in? cm per sec? And are you allowed to leave pi as ... | |
| trigonometry | 6/9/2011 |
| Q: Workers at a mine have dug a tunnel that is 110 feet long and forms an angle of 38 degrees with the ... A: Let * represent the degree symbol, opp represent opposite, hyp represent hypotenuse ... | |
| patterns | 6/3/2011 |
| Q: "Hi Sherryif given a series of triangles composed of evenly spaced dots: . . . etc. ... A: Can you put the actual question in a file and attach it? What you have written does not make sense. ... | |
| finding n | 5/30/2011 |
| Q: ((3*n + 1 = k**2) and (4*n + 1 = m**2)) implies n is divisible by 56 I can show that n is ... A: Helmut~ I see a couple of things I will need clarified. I am not certain what your asterisks (*) ... | |
| Abstract Algebra | 5/27/2011 |
| Q: My question is: find the order of the element (1 2)(3 4 5) in S5. I'm struggling with how to find ... A: I want to add a couple of notes below my signature Nik~ The elements in S5 are composed of all ... | |
| Hours of work. | 5/26/2011 |
| Q: 9.00am – 5.30pm no break 8.30am – 5.30pm no break 8.30am – 5.30pm no break 9.30am – 5.30pm no ... A: A~ 8.5 + 9 + 9 + 8 + 7 = 41.5 hours Here let me help you learn to do this by yourself. First use ... | |
| math | 5/25/2011 |
| Q: If ∆PQR ≅ ∆MNS, which of the following is true? ∠P ≅ ∠N MN ... A: Chris~ When two triangles are equal corresponding sides and angles are congruent and equal in ... | |
| Decimals | 5/20/2011 |
| Q: I have took a gap year and now I am struggling with a concept I used to breeze by. I vaguely ... A: Darina~ No I do not have any idea what you are referring to but I can make some observations: .35 + ... | |
| Solving General Triangles and Calculating Area | 5/17/2011 |
| Q: 1. In triangle ABC, c = 10 and Ð A = Ð B = 40°. Find the length of the median to segment AC. ... A: I think you missed the purpose of this website. The purpose of this website is to help students ... | |
| final grade | 5/16/2011 |
| Q: I'm wanting to plug in final exam scores into an equation to find my final grade in one class. My ... A: Katie~ If I understand you correctly, you have 96% but only 80% of your grade is calculated with ... | |
| Unique solution | 5/15/2011 |
| Q: I have tried all my best to answer the question in the attachment. Please help. Thanks Aba A: The primary way to show anything is unique is to assume there is more than one (usually two) and ... | |
| Algebra 2 | 5/12/2011 |
| Q: Simplify: 30 x^2 y^3/-6x^3y^2? A: Danielaa~ The easy part is to do the division of 30/-6 = -5 and since you have 2 factors of x in ... | |
| Labeling triangles | 5/8/2011 |
| Q: I'm currently covering the law of sines and cosines. I'm understanding the algebra portin so far, ... A: Gene~ The ambiguous case comes from looking at any triangle and having know information of SSA, ... | |
| Labeling triangles | 5/8/2011 |
| Q: I'm currently covering the law of sines and cosines. I'm understanding the algebra portin so far, ... A: Gene~ Just from your statement "...where the hypotenuse is..." tells me you don't understand what ... | |
| average of random overlaps | 5/3/2011 |
| Q: I think I might have known how to do this once. Right now I can't wrap my head around it, though. ... A: Mac~ I've not heard of 'random overlaps' so I will approach this just from a probability stand ... | |
| algebra | 5/2/2011 |
| Q: the numbers of elements of S5(the symmetric group of 5 letters ) which are their own inverse equals ... A: Geeta~ We can make the communication of this problem simpler by just defining A inverse as A^-1. ... | |
| trying to work out what I get paid.. | 5/2/2011 |
| Q: I am a contractor who gets $450+GST per day. But due to Easter I could only work 7 days so after ... A: J~ I am wondering if you just want to know the approximate take home pay or if you want to know how ... | |
| algebra | 4/30/2011 |
| Q: the numbers of elements of S5(the symmetric group of 5 letters ) which are their own inverse equals ... A: Geeta~ First you need to know how many 2x2 matrices can be made up of the elements in Z3. Z3 = ... | |
| algebra | 4/30/2011 |
| Q: the numbers of elements of S5(the symmetric group of 5 letters ) which are their own inverse equals ... A: Geeta~ The only elements that are inverses of themselves in S5 are those that are transpositions ... | |
| algebra | 4/29/2011 |
| Q: the numbers of elements of S5(the symmetric group of 5 letters ) which are their own inverse equals ... A: Geeta~ How many 2-cycles are there in S5? First think of the elements as being (1,2,3,4,5) for ... | |
| Probability | 4/29/2011 |
| Q: The probability of four people out of ten having a blue ticket at a charity ball is 0.2508. What is ... A: This is a binomial probability distribution problem, specifically a Bernoulli Trial. Recall P(x) = ... | |
| College Algebra | 4/28/2011 |
| Q: 2log(x+5)=log27+log3 A: Kristan~ There are probably a lot of ways to answer this question and here is just one way: ... | |
| Roofing pitching ,Length of Hypotenuse using cos degrees | 4/27/2011 |
| Q: When working out rafter lengths in the building trade we are taught half span divided by cos degrees ... A: Joss~ Aha! Now I know what you want. There is a key on your calculator that either says cos^(-1) ... | |
| Probability and Statistics | 4/26/2011 |
| Q: In one popular new restaurant, data was collected to determine the mean waiting time to be seated at ... A: Andrea~ More than one hour means the wait is greater than 60 min. The difference between 60 and 45 ... | |
| Math-Proofs | 4/26/2011 |
| Q: Prove the following conjecture using each of the two methods introduced in this module -- ... A: Let p = 3m-n is even and q = m is odd and r = n is odd, then this proposition is If p & Q then r. ... | |
| Probability and Statistics | 4/26/2011 |
| Q: In one popular new restaurant, data was collected to determine the mean waiting time to be seated at ... A: If the mean is 45 and the std dev is 12, then you want to know how many std dev 20 min is from 45. ... | |
| non linear inequality | 4/25/2011 |
| Q: Solve the following nonlinear inequality: -3x^2-2x<=2x+4 Express the answer in interval ... A: Reemal~ The way the question is written there is no solution in the real numbers, thus there are no ... | |
| Roofing pitching ,Length of Hypotenuse using cos degrees | 4/25/2011 |
| Q: When working out rafter lengths in the building trade we are taught half span divided by cos degrees ... A: I didn't answer your question because what you say does not make mathematical sense to me. Did you ... | |
| Probability | 4/24/2011 |
| Q: A bowl of marbles contains 8 red marbles, 3 green marbles, 7 black marbles, and 9 blue marbles. What ... A: Andrea~ Find the total number of marbles: 8 +3 + 7 + 9 = 27 marbles with replacement makes the ... | |
| Mathematical series | 4/23/2011 |
| Q: Do you know of any function that has a series (like a Taylor series) that begins: 1/r^2 - 1/2*r^3 ... A: Phillip~ Just based on what you gave me and not knowing for sure if the signs will alternate but ... | |
| college algebra | 4/23/2011 |
| Q: true or false the product of two rational numbers is always a rational number A: Lucille~ Absolutely! Do you need to prove it? Here is the reason why: the smallest set of numbers ... | |
| Probability | 4/22/2011 |
| Q: One tutor marking an extra credit assignment offered the following marks: ... A: Wow, I can tell you what the answer is because I just 'grunted' it out but you should be telling me ... | |
| Probability | 4/22/2011 |
| Q: The probability of Clara going through a math class without laughing is 26%. What is the probability ... A: This is a binomial probability distribution problem, meaning Clara either laughs or she doesn't, ... | |
| maths | 4/21/2011 |
| Q: 1a) with0ut using calculator or table, find the value of log3.6given that log2=0.3010,log3=0.4771 ... A: Samuel~ I can help you with part 'a' but part 'b' is not coming across making any sense, because ... | |
| Complex Fractions | 4/19/2011 |
| Q: How is the answer determined for adding these two complex fractions? 2/(2/3) + 3/(1/5) If I divide ... A: Absolutely I did make a typo, good catch :) Ok say you want to add 2/7 + 4/11. You know your common ... | |
| Complex Fractions | 4/18/2011 |
| Q: How is the answer determined for adding these two complex fractions? 2/(2/3) + 3/(1/5) If I divide ... A: how are you doing? It's been awhile since I'e answered a question for you. I will respond for your ... | |
| Nonlinear inequality | 4/17/2011 |
| Q: Solve the following nonlinear inequality: -3x^2-2x<2x+4 its less then and equal to.. ... A: John~ The way the question is written there is no solution in the real numbers, thus there are no ... | |
| parabola | 4/17/2011 |
| Q: Write the standard equation of the following: y=-4x^2+3x-2 A: This seems to be in the standard form of a quadratic equation. The standard form of a 2nd degree ... | |
| Nonlinear inequality | 4/17/2011 |
| Q: Solve the following nonlinear inequality: -3x^2-2x<2x+4 its less then and equal to.. ... A: John~ The way the question is written there is no solution in the real numbers, thus there are no ... | |
| Arithematic | 4/16/2011 |
| Q: I read in a book that a number is divisible by 3 if sum of the digits is divisible by 3 . I dont ... A: Ok, try this: count by 3's:3,6,9,12,15,18,21,24,27,30. Notice that multiples of three can end in any ... | |
| Math | 4/16/2011 |
| Q: A student walks 50m on a bearing of N25E and then 200m due east. How far is she from her starting ... A: Ade~ The starting point is at the origin of an x-y coordinate system. Being told that the bearing ... | |
| Arithematic | 4/15/2011 |
| Q: I read in a book that a number is divisible by 3 if sum of the digits is divisible by 3 . I dont ... A: Abhinav~ First, what you read is true. Without knowing your mathematical background it is hard to ... | |
| The Use of Probability | 4/13/2011 |
| Q: My math class has nearly finished our probability unit, and I honestly hate the subject. Why would ... A: I can think of a lot of reasons one might want to use probability in real life. For one, statistics ... | |
| College Algebra/ Logarithms | 4/12/2011 |
| Q: Will you show or help me to re-write the expression ln((x+3)/xy) as a sum, difference,and/or ... A: You can take a quotient of logs such as log(a/b) and write it as a difference of logs, like log a - ... | |
| differetiation:product and quotient rule | 4/11/2011 |
| Q: cos theta/1-sin theta A: What is the question? Are you wanting to take the first derivative of cos x/(1-sin x)? [I used x ... | |
| quamtative analysis | 4/9/2011 |
| Q: 1. Calculate the mean, median and mode from the following data relating to production of a steel ... A: manoj~ Your list of data is not as clear as it could be. Since you have 5 measures in tons and 5 ... | |
| math proof | 4/4/2011 |
| Q: Prove this proposition using contrapositive or contradiction. For all real numbers t, if t^2 is ... A: Heather~ I will do a proof for both ways using contrapositive and contradiction. contrapositive: ... | |
| Properties of relations | 4/3/2011 |
| Q: Let A={a,b,c,d}. How many relations defined on A are reflexive, symmetric, and transitive and ... A: Xin~ Reflexive means aRa and in (a,b), (b,c), and (c,d) there are no reflexive. (You would need one ... | |
| Math notation to say variable B affects A in a interval | 4/2/2011 |
| Q: Actually I have a simple question on maths notation. Informally speaking, I have a variable A that ... A: Fabricio~ You need to give me more explicit information. How is the variable B related to the ... | |
| maths | 4/2/2011 |
| Q: 1)Using an appropriate double-angle formula ,expres cos(4theta)in terms of cos (2theta). Using your ... A: Elle~ I thought this was answered but I guess it is still not clear. What I am going to use as an ... | |
| differential calculus | 3/27/2011 |
| Q: The minute hand of the clock is 4 in long. Starting from the moment when the hand is pointing ... A: Area of a sector = (1/2)r^2*theta where theta is measured in radians so we want DA/dt But we don't ... | |
| Hours of work. | 3/24/2011 |
| Q: Just need help with my hours of work, i.e. total hours I worked. 8 - 5.30 with half hour break 8 - ... A: A~ If you are using 5.30 to mean 5:30 please state so, otherwise these numbers do not make any ... | |
| Convergence | 3/22/2011 |
| Q: This was my reasoning using the comparison test: e^(2*sqrt(k))> k^(3/2) since "exponential growth ... A: Michael~ For part b, rather than decipher what you wrote I will answer the question the way I would ... | |
| Convergence | 3/22/2011 |
| Q: This was my reasoning using the comparison test: e^(2*sqrt(k))> k^(3/2) since "exponential growth ... A: Michael~ I like your comparison, very good. Just make sure you show that you multiplied both sides ... | |
| Series | 3/21/2011 |
| Q: Wallin how are you? I have to find if the following series converge: a) Sum from k=1 to k=inf of ... A: Michael~ My bad, you are right the series does tend to 1 and not 0 so my recommendation is for you ... | |
| Series | 3/21/2011 |
| Q: Wallin how are you? I have to find if the following series converge: a) Sum from k=1 to k=inf of ... A: Michael~ I don't agree with your part c. As I read '2k choose k', this take 2k things and choose ... | |
| Series | 3/21/2011 |
| Q: Wallin how are you? I have to find if the following series converge: a) Sum from k=1 to k=inf of ... A: Michael~ You have a_(k+1)/a_k=(((k+1)/k)^k)*(k+1) * e^(-2k+1) and it should be ... | |
| maths | 3/16/2011 |
| Q: 1)Using an appropriate double-angle formula ,expres cos(4theta)in terms of cos (2theta). Using your ... A: Elle~ There are a couple of ways to interpret 'find the image of the function' and it really ... | |
| maths | 3/16/2011 |
| Q: 1)Using an appropriate double-angle formula ,expres cos(4theta)in terms of cos (2theta). Using your ... A: Elle~ By image of the function, I assume you want the graph?? f(x) =-2x^2-12x -10 expanded and you ... | |
| Hours of work. | 3/15/2011 |
| Q: I worked 7.3-5 7.3-5 8-5 8-5 8-5 This week with only a half hour lunch break each day. How many ... A: If all you took was .5hr luch break ou could subtract that off each difference or you could just ... | |
| area under curve | 3/15/2011 |
| Q: Determine the area bounded between the line y = | x – 1 | and circle x2 + y2 = 5 A: If you graph both in the first quadrant you will see that y = |x - 1| is 'above' x^2 + y^2 = 5 so ... | |
| maths | 3/14/2011 |
| Q: 1)Using an appropriate double-angle formula ,expres cos(4theta)in terms of cos (2theta). Using your ... A: Elle~ First let's use x for theta so we have cos(4theta) = cos(4x) = cos[2(2x)] = 2cos^2(2x) - ... | |
| trig | 3/14/2011 |
| Q: i have tried to work with this problem in order to understand how to solve such problem but I get ... A: Vidhi~ Ok, I read your problem and your comments and I want to ask you where is (-pi,pi)? -pi is ... | |
| Hours. | 3/10/2011 |
| Q: Just wondering what the following hours add up to I don't think using a calculator in terms of time ... A: JJ~ Just add up the numbers and get 42.5 hours. Of course you know that .5 is a half hour but if ... | |
| Trigo Proof | 3/6/2011 |
| Q: I have encountered a proving question on trigo as shown below; Prove 2cos36 = 1+2cos72. RHS; ... A: Are these the identities you were given? Usually identities and proofs are for arbitrary or general ... | |
| Mathematics | 2/27/2011 |
| Q: Ms. Sherry Wallin, MathProf: Please review and critique: Given: in Positive Real numbers; ... A: I don't follow your first proof. How can you multiply each term by a different amount? If you want ... | |
| Is there another way to solve this problem? | 2/26/2011 |
| Q: I created a method to solve this problem and many similar, more complicated problems as well but I ... A: I have no clue. There comes a point in your mathematical maturity where you feel confident that you ... | |
| Is there another way to solve this problem? | 2/25/2011 |
| Q: I created a method to solve this problem and many similar, more complicated problems as well but I ... A: Samuel~ Before I invest any amount of time I would like for you to show me what method you used! ... | |
| College Algebra | 2/23/2011 |
| Q: I am in College Algebra. I have a tutor for my class and do many practice problems, but I am still ... A: Briane~ You know what a linear equation looks like, right? And when that linear equation is in ... | |
| discrete mathematics | 2/20/2011 |
| Q: I'm learning(trying to)how to do proofs. Can you work this example out for me, the book isn't much ... A: Paula~ Proofs are difficult and only come over a long time of reviewing, reading, and deciphering ... | |
| Probability Question | 2/18/2011 |
| Q: after examining a collection of newspaper articles about politics, following joint probabilities ... A: Neelufar~ a) The probability of having economy is just the sum of the probabilities under economy ... | |
| trigonometry equation | 2/16/2011 |
| Q: 6 tan^2 x – 2 cos^2 x = cos2x if cos2x = ? ANSWER: Vipul~ When x = pi/6 cos 2x = pi/3 and cos ... A: Vipul~ Start by moving cos 2x to the left getting 6 tan^2 x – 2 cos^2 x - cos2x = 0 Now change ... | |
| fallacies | 2/16/2011 |
| Q: 0/0=undefined........ 0/0=(0*0)/0=(0/0)*0=0^0*0^1=0^(0+1)=0^1=0.....how?????? A: Will~ I can try to answer this step by step: You are given that 0/0 is undefined and then there is ... | |
| Maths-Circle | 2/15/2011 |
| Q: Show that the line x+2y-5=0 touches the circle x^2+y^2=5 and x^2+y^2+2x+4y-15=0 at the same point ... A: Dhananjay~ Take x+2y-5=0 and put the constant on the right hand side getting x+2y=5. You have ... | |
| trigonometry equation | 2/14/2011 |
| Q: Sin^5 x – cos^5 x = 1/cosx – 1/sinx (sin x ≠ cos x ) A: Vipul~ Please write out the complete question, it is not clear if you have an identity here or if ... | |
| trigonometry equation | 2/13/2011 |
| Q: (1) If sin x = cos y, √6 sin y = tan z and 2 sin z = √3 cos x ; u, v, w denotes ... A: Vipul~ This is another one of those problems where you could go off the deep end searching for that ... | |
| Maths-Determinant | 2/12/2011 |
| Q: Find the value of ' ' '-1 0 -1 ' ' ' ' 0 -1 -1 ' ' ... A: Dhananjay~ To find the determinant of a 3x3 matrix you need to choose whether you want to operate ... | |
| trigonometry equation | 2/11/2011 |
| Q: FIND THE GENERAL SOLUTION OF THE EQUATION COS X COS 6X = −1 ANSWER: Vipul~ What level of ... A: Vipul~ You need to use trigonometric identities to get the angle 6x down to an angle of x. It would ... | |
| trigonometry equation | 2/10/2011 |
| Q: FIND THE GENERAL SOLUTION OF THE EQUATION COS X COS 6X = −1 A: Vipul~ What level of math is this from? Specifically, what course is this problem from? Is this ... | |
| Advanced Functions | 2/8/2011 |
| Q: I need some help with this"Show the use of Pascal's triangle to expand (x+2)^4 by reproducing the ... A: TB~ Do you know what Pascal's Triangle looks like or how it is found? The first row is for (a+b)^0 ... | |
| degree of expansion | 2/6/2011 |
| Q: I hope you can help me with this problem: Given: (x+1)to the power of 35 What is the degree of the ... A: Hmmm...how can I lead you to the answer without giving you the answer? What is (x+1)^1? x+1 -> ... | |
| Trigonometry | 2/4/2011 |
| Q: A force vector F that points to the right and upward 37 degrees from the horizontal has a magnitude ... A: Sam~ Any vector can be written with x and y components, thus the force vector F can be written as ... | |
| Direct & Inverse Variations | 2/4/2011 |
| Q: A varies jointly as R1 and R2 and inversely as the square of L. Determine a when R1=120, R2=8, L=5 ... A: Meisha~ The first variable mentioned that varies is always the dependent variable, that is by ... | |
| Quantitative Analysis for Managerial Applications | 2/3/2011 |
| Q: The monthly incomes of a group of 10,000 persons were found to be normally distributed with mean ... A: Sayali~ Of the 10,000 persons the richest are the persons numbered 9751 - 10,000, so person 9751 ... | |
| statistics | 2/2/2011 |
| Q: The values of a,b,c in a quadratic a x2 + b x + c = 0 is determined by throwing an ordinary die with ... A: Neal~ In order to find the probability that you will get real roots in the quadratic ax^2 + bx + c ... | |
| value | 2/1/2011 |
| Q: what is the definition of value and what is the value of 4 in 229.4,4156,740,34? A: The definition of value is used as the place value of a number. The number 4 is used in several ... | |
| Probability | 1/30/2011 |
| Q: A parent-teacher meeting was attended by 37 parents along with 26 high school students. A committee ... A: Andrea~ Let's see if we can use logic to answer this question. There are 26 students and each ... | |
| Probability | 1/29/2011 |
| Q: Ms.Sherry, I have solved this question's answer. Can you please check my answer for whether that ... A: Andrea~ Your reasoning seems fine, the only thing I can see that needs to be fixed is the answer ... | |
| Probability | 1/29/2011 |
| Q: Peter wrote a computer program that randomly printed the letters of the words given to it. The ... A: I am not sure I completely understand this question. This is the way I interpreted it: The computer ... | |
| Probability | 1/28/2011 |
| Q: Grade 10 class playing badminton in the gym didn't clean up properly after they were done. When the ... A: Andrea~ If you want the probability of getting at least 1 plastic shuttlecock this means it could ... | |
| Probability | 1/28/2011 |
| Q: Grade 10 class playing badminton in the gym didn't clean up properly after they were done. When the ... A: Andrea~ There are a total of 12+9 = 21 shuttlecocks in the bag. Let f = drawing a feathered ... | |
| precalculus | 1/28/2011 |
| Q: P(x,y) is an arbitary point on the circle x squared + y squared=36 express the distance from P to ... A: Sarah Smith~ First, notice that (0,8) is NOT on the circle described by x^2+y^2 = 36. This is a ... | |
| math | 1/25/2011 |
| Q: simplify: i times the square root of -98 minus the square root of 98 Write the fraction as a ... A: Suzy~ First things first: sqrt(-98) = i*sqrt(98) so we really have i^2*sqrt(98) - sqrt(98) = ... | |
| Reincarnation | 1/20/2011 |
| Q: Is reincarnation a mathematical impossibility? A: Kristian~ In my humble opinion, I would say it is not a mathematical impossibility but this is not ... | |
| Logs within Logs | 1/20/2011 |
| Q: My finals are coming up soon and there is one problem that throws me off a lot and its mostly ... A: Cam~ You are missing a parenthesis or you have too many parenthesis. Since you said it is a log ... | |
| Functions College Algebra | 1/19/2011 |
| Q: If f(4)=0 and f(6)=6, which of the following could represent f(x)? a. 2/3x-4 b. x+2 c. x-4 d. 3/2x+6 ... A: Brittney~ f(4) = 0 is saying that you have an ordered pair of (4,0) and f(6) = 6 means there is an ... | |
| finite math: linear programming the simplex method | 1/17/2011 |
| Q: DETERMINE WHETHER THE GIVEN SIMPLEX TABLEU IS IN FINAL FORM. IF SO, FIND THE SOLUTION TO THE ... A: Crama~ I am not sure what you mean by final form. Also, where is the objective function? Typically ... | |
| word problem w/fractions | 1/15/2011 |
| Q: A receipe uses 6 cups of flour to 1 1/4 cups of milk. If you have 2 cups of flour, how much milk ... A: Sherry~ I see two ways to solve this problem. The first is an intuitive way. I am looking at the ... | |
| calculus theory | 1/13/2011 |
| Q: Let f: [0,1] --> R be a differentiable function with a continuous derivative such that f(0)= f(1)= ... A: Tony Chu~ Hi Tony~ My bad, I misread the original problem, I thought it said that f'(0) = f'(1) = ... | |
| I am so confused | 1/9/2011 |
| Q: I have this algebra question from my algebra class and can not figure it out. It is a demand ... A: these problems are usually linear equations and usually you are given enough information, like data ... | |
| precalculus trig. verifying identites | 1/8/2011 |
| Q: would you please help me figure out how to verify tanƟ+cotƟ= 2csc2Ɵ ? A: Kim There are a couple of ways to approach this problem. Since 2csc2Ɵ is the 'more ... | |
| COmparing the steepness of the growth curves! | 1/7/2011 |
| Q: Ms.Sherry, A Very Happy New Year! I have been given this data table and the graph and I am ... A: Andrea~ The curve that has the most change from the beginning to the end is one way to determine ... | |
| simultaneous equations | 1/5/2011 |
| Q: Could you please help me in solving the following simultaneous equation with 3 variables. 0.5 x = ... A: Stephen~ The first thing you are going to want to do is simplify the existing equations. Both the ... | |
| Alternative Simple Interest Calculation | 1/4/2011 |
| Q: Sherry: I have to send a new message since only three follow-up questions are allowed. Here is what ... A: "What is the purpose of the (1% for 360 days) in 644/360 X $7.20(1% for 360 days)= $12.88? The ... | |
| Simple Interest | 1/3/2011 |
| Q: I read the following in a business mathematics book regarding the percent-day method for calculating ... A: If I ask you what 10% of 100 is you would tell me 10, correct? If I ask you what 1% of 100 is you ... | |
| algebra and geometry | 12/30/2010 |
| Q: A=LW make (L)the subject. P=2L+2B make (L) the subject xoverw plus 5 equals 7 make (x) the ... A: John~ Sorry but I haven't got a clue what you want. What is a subject? This isn't typical ... | |
| For a marathon, 24,000 liters of energy drink must be used. An energy drink contains 8 grams energy powder per 100 ml water. The energy drink contains a total of 1.25 kg. How many cans of energy drink must be used for the marathon? | 12/29/2010 |
| Q: For a marathon, 24,000 liters of energy drink must be used. An energy drink contains 8 grams energy ... A: Kristian~ There must be some missing information here. The reason I say this is that your statement ... | |
| Find the solution algebraically | 12/29/2010 |
| Q: y=3x^2-2x-2 x+y=4 A: Trisha~ One way to solve this system of equations is to solve each for one variable and it might as ... | |
| Finding the roots by completing the square | 12/27/2010 |
| Q: 3x^2-6x+6=0 How do I find them? What are the roots to this equation? A: Sally~ First I would factor out the 3 because the coefficient on the squared term needs to be 1 ... | |
| Maths-Permutation | 12/25/2010 |
| Q: While calculating Quartile deviation for indiviual observation we use the formula Q1=value of ... A: Dhananjay~ If you want to know how many days are left in say December and today is the 24th, how do ... | |
| Exponential functions | 12/24/2010 |
| Q: Sherry, How are you? Good!? I am unable to understand one question from my textbook! It ... A: Xiang~ Do you know what y=3^x looks like? y=3^x passes through (0,1) because when x=0, y=3^0-> y = ... | |
| Simple Interest | 12/19/2010 |
| Q: I read the following in a business mathematics book regarding the percent-day method for calculating ... A: You made one fatal mistake and that is when the author went from $720 to $7.20 he didn't multiply by ... | |
| Simple Interest | 12/17/2010 |
| Q: I read the following in a business mathematics book regarding the percent-day method for calculating ... A: When you multiply by an interest rate by some number of days, call it n days, you have units of n ... | |
| difference of quotients | 12/17/2010 |
| Q: please help me solve, step by step, f(x)= 20/x+15 in the form f(x+h)-f(x)/ h. thank you A: lexisha~ You need to write what you want properly. Do you mean (20/x) + 15? I doubt it, but yet, ... | |
| Pre-Calculus | 12/15/2010 |
| Q: Set including solutions of multiple-angle equation in interval [0,2π) for equation sin 2x=1/2 A: Ro~ There are a couple of ways to work this problem. One, you can ask yourself what angle for the ... | |
| Tree Diagram | 12/14/2010 |
| Q: An Automobile Company required to analyze expense claims.Hence,it studied the major cities that its ... A: Andrea~ What I have been making for you are tree diagrams, so start a branch with major cities and ... | |
| Combinatorics | 12/13/2010 |
| Q: Robert claims that he can always tell the difference between diet pop and regular pop.To test his ... A: Andrea~ It doesn't matter when in the sequence a certain order is found so think of it this way. ... | |
| Logarithms | 12/13/2010 |
| Q: Sherry! I have this question,in which I am not able to move forward.Can you tell me what should ... A: Xiang~ This is what I would do: (1/2)log_3(144) - log_3(4) + 2log_3(3) = (1/2)log_3(12^2)-log_3(4) ... | |
| question on derivitives | 12/12/2010 |
| Q: Recently, I've been fooling around with my ti-89 to figure out why x^(1/x) maximizes at e. I used ... A: Terrence~ I still am not sure what you are trying to find out. Perhaps you have typed it wrong? If ... | |
| question on derivitives | 12/11/2010 |
| Q: Recently, I've been fooling around with my ti-89 to figure out why x^(1/x) maximizes at e. I used ... A: Terence~ Why doesn't what equal what? It is not clear what you are inquiring about. If you are ... | |
| Pre-Calculus Final Review | 12/11/2010 |
| Q: last time I asked you a question you requested that I submit my work and answers for each problem, ... A: Page~ For #1: Graphing to find a point of intersection is the last thing you want to do. It only ... | |
| Arithmetic Sequence | 12/10/2010 |
| Q: Could you please help me with this question? Q: The rth term of an arithmetic progression is 1+4r. ... A: Toon993~ The rth term can be considered the nth term so just replace the r with the n. The sum of n ... | |
| question on derivitives | 12/10/2010 |
| Q: Recently, I've been fooling around with my ti-89 to figure out why x^(1/x) maximizes at e. I used ... A: I am trying to follow your argument and you did say you are taking the derivative of t^(1/x) with ... | |
| Combinatorics | 12/9/2010 |
| Q: Letters in the word SPORT are arranged in the shape of a diamond.Starting from the top of the ... A: Attached you will find a way to track how many ways you could write sport moving diagonally down ... | |
| Mathematical Induction | 12/8/2010 |
| Q: My problem is to prove the inequality (3n+20)<(3^n) for all n>=4. The Basis step is obviously easy ... A: Scott~ It is always a pleasure to answer a question like this. This is how I would do the problem. ... | |
| sequences and series | 12/8/2010 |
| Q: Ms.Sherry, I am not at all able to understand what is the difference between recursive and ... A: Xiang~ The difference between recursive and explicit is, for example, with the geometric sequence ... | |
| Pre-Calculus Final Review | 12/7/2010 |
| Q: Sherry, I have previously asked you a question and you helped me so much and explained each step in ... A: Please next time show me your work and answers. I don't typically give answers. 1) -1 add the real ... | |
| Series | 12/6/2010 |
| Q: Sherry, Can you please teach me how to graph the values of Sk1-Sk2 ie, Sk1 = ... A: You can pretend sk1 is y and then plot points like you learned in beginning algebra: x | y(or ... | |
| Combinatorics | 12/5/2010 |
| Q: I am given a sum in which,1)One child invited to the party is given 2 books as a thankyou gift.If ... A: Andrea~ The first question is the easiest, it is merely 15C2, that is you have 15 things that you ... | |
| algebra 2 | 12/4/2010 |
| Q: Describe the system 6x-2=10 and 9x-3y=8 as consistent and independent, consistent and dependent, or ... A: Anthony~ 6x -2y = 10 solve for y: -2y = -6x + 10 => y = 3x -5 Recall the other equation in slope ... | |
| algebra 2 | 12/4/2010 |
| Q: Describe the system 6x-2=10 and 9x-3y=8 as consistent and independent, consistent and dependent, or ... A: Anthony~ Consistent and independent means that there is one and only one solution, i.e., that the ... | |
| Combinatorics | 12/4/2010 |
| Q: This is a combinatrics lesson sum.-A committee of atleast 2 people is chosen from a group of 8 ... A: Andrea~ Have we discussed Pascal's Triangle? 1 1 1 ... | |
| Maths -Permutation and combination | 12/2/2010 |
| Q: 15)How many five digit numbers can be formed using the digit 0,1,2,3,4 and 5 which are divisible by ... A: Dhananjay~ Numbers that are divisible by 3 have an interesting characteristic and that is if you ... | |
| Maths -Permutation and combination | 12/2/2010 |
| Q: How many even numbers greater than 300 can be formed with the digits 1,2,3,4,5 if the repetation of ... A: Dhananjay~ I will get you going on the thought process necessary to logically arrive at your ... | |
| number theory | 12/1/2010 |
| Q: Expert Sherry Wallin: Please confirm the following statements are true in Real numbers when x,y,z ... A: I'm not sure what your question is. Did you want me to confirm or deny your proof? I will make ... | |
| number theory | 12/1/2010 |
| Q: Expert Sherry Wallin: Please confirm the following statements are true in Real numbers when x,y,z ... A: Lee~ Part a is true. Consider Pythagoreans Theorem. Given any hypotenuse, c, square it, c^2, there ... | |
| 5 trigonomic functions | 12/1/2010 |
| Q: I'm confused as to how to find out what quadrant it is in if the problem given is secA= 6/5 , tanA < ... A: The sec A is 1/cos A, correct? Where is the cos A negative? Wherever x is negative, in QII and QIII. ... | |
| sequences and series | 11/30/2010 |
| Q: Miss Sherry, Thank god you arent maxed out right now! I typed in one Question to Mervyn ... A: If I am interpreting this correctly then you have the original price call it a. Then at the end of ... | |
| Logarithms | 11/30/2010 |
| Q: For the equation log y = log(0.5x-3) + log2,state the domain.Then express y as a function of x. ... A: Andrea~ The domain of the log function is that the log x, where x is greater than 0. In your ... | |
| Maths-Permutation and combination | 11/29/2010 |
| Q: Find n if [n!/3!(n-5)!]:[n!/5!(n-7)!]= 1:6 ANSWER: Dhananjay~ Are the (n-5)! and the (n-7)! in ... A: Dhananjay~ [n!/[3!(n-5)!)]/[n!/(5!(n-7)!)]) = 1/6 the n! cancel with each other and (n-5)! = ... | |
| Logarithms | 11/28/2010 |
| Q: Solve log_5(x-4)= log_7(x) for x.Round your answer to 4 decimal places. ... A: Most calculators will only give answers in base 10 or in base e (ln x) but yes you can put it in any ... | |
| Maths-Permutation and combination | 11/28/2010 |
| Q: Find n if [n!/3!(n-5)!]:[n!/5!(n-7)!]= 1:6 A: Dhananjay~ Are the (n-5)! and the (n-7)! in the denominators or the numerators? If they are in the ... | |
| Logarithms | 11/28/2010 |
| Q: Solve log_5(x-4)= log_7(x) for x.Round your answer to 4 decimal places. ... A: Andrea~ The first thing to do is to use the change of base formula and get all the logs in the same ... | |
| Trig | 11/26/2010 |
| Q: Can you please help me. Please! Can you please help me. Solve 4sin(square)A + 1 = sin(square)A + ... A: The sin θ at 0 deg is 0 and then at 90 deg is 1 and at 180 deg is 0 again and at 270 deg is -1 ... | |
| hi | 11/25/2010 |
| Q: given 3 lines in the plane such that points of intersection form a trianlge with sides 20, 20,20. ... A: Sumathi~ There is only one point and it is inside the triangle. Take the triangle and drop a ... | |
| Sequences and Series | 11/25/2010 |
| Q: Miss Sherry, I am sorry for disturbance,but you told "When I did the sum I got 5.4661 ... A: Xiang~ It is a good idea to enclose any fraction in parentheses. In this case because the fraction ... | |
| Msc in Maths | 11/24/2010 |
| Q: I am Ravi from India. I did my B.Tech in Indian Institute of Technology(IIT) in Biotechnology ... A: Ravi Shankar V~ The only school I know of that you can study mathematics rigorously online is Texas ... | |
| Sequences and Series | 11/24/2010 |
| Q: Miss Sherry, How are you? I have the following question and it's answer I have uploaded in ... A: Xiang~ Here are a few observations I made: In the first problem you say that r = pi/10 but you ... | |
| Maths -Permutation and combination | 11/23/2010 |
| Q: (n+3)!=110(n+1)! Find the value of n ,where n! is n factorial A: The interesting thing about factorials is that you can find immense cancellation. For example 5!/3! ... | |
| Combinatorics | 11/23/2010 |
| Q: Irena was born on june 23,1978(written 23/06/78 on her driver's licence). Therefore,the numbers she ... A: Andrea~ With repetition means that she could have xxxx, so there are 6 choices for the 1st number, ... | |
| Sequences and Series | 11/22/2010 |
| Q: Clara started a new job.Her starting gross monthly salary is $3200.Each year,on the anniversary of ... A: You will need to take the (n-1)th root on both sides, not! just kidding! Take the natural log of ... | |
| Sequences and Series | 11/22/2010 |
| Q: Clara started a new job.Her starting gross monthly salary is $3200.Each year,on the anniversary of ... A: Xiang~ This fits the binomial expansion for (a+b)^n where a = 1. Let's look at what you have: A ... | |
| Sequences and Series | 11/22/2010 |
| Q: Martina entered a function into her calculator and found the following partial sums: Sn where n is ... A: Xiang~ Examine a pattern. I noticed that S2 = 5*S1 and that S3 = 5*S2 and that S4 = 5*S3 etc. So ... | |
| Trigonometry(Coterminal angles) | 11/21/2010 |
| Q: Explain the reason,why -5pi/9 and 5pi/9 are not coterminal angles. Dear Ms.Sherry, So, my textbook ... A: If they differ means you add/subtract a multiple of 2pi to your angle. In your case this is: -5pi/9 ... | |
| Trig | 11/20/2010 |
| Q: Can you please help me. Please! Can you please help me. Solve 4sin(square)A + 1 = sin(square)A + ... A: Kamla~ There are a number of ways to do this kind of problem. One is to use substitution so that it ... | |
| reduction formula | 11/19/2010 |
| Q: i have been given the reduction formula Fn(s) =nF(n-1)(s)/s and i need to find an expression using ... A: Jason~ Let's start by making some rules for clearly stating the problem. When you want to say "ef ... | |
| probability question | 11/18/2010 |
| Q: the probability that a person selected at random from a population will exhibit the classic symptom ... A: Jaspreet~ Let A be the event that a person demonstrates the classic symptom Let B be the event that ... | |
| Expanding a problem | 11/14/2010 |
| Q: I am having difficulty with this problem. (2x-5y)^6 A: Jillian~ There are a couple of ways to expand this and several different methods. I am not sure ... | |
| macroeconomics | 11/9/2010 |
| Q: In the assignment I need to calculate the growth rate from current year to years in the future. It ... A: Greg~ I'm not sure what you are doing but I will try to explain how you should be interpreting the ... | |
| Finding identity and inverse of group operation | 11/8/2010 |
| Q: I am trying to show that the below operation is a group. I have showed that it is closure and ... A: Raymond~ First you must have an identity in order to have an inverse. So let x be in G so that x*e ... | |
| Precalculus | 11/6/2010 |
| Q: A car's rear windshield wiper rotates 130°. The total length of the wiper mechanism is 25 inches and ... A: Kristin~ Here is a revised answer Here is the answer to your questions with a drawing labeled and ... | |
| trigonometry problem | 11/5/2010 |
| Q: I have been frying my brain trying to figure this equation. verify that: (cos(x)/2 - sin(x)/2)^2 = ... A: Adam~ Maybe the statement is not true if you can't "figure it out". You always want to believe ... | |
| geometry | 11/4/2010 |
| Q: Is "12*12=144 and 21*21=441,13*13=169 and 31*31=961,103*103=10609 and 301*301=90601, 112*112=12544 ... A: Domingo~ What is your definition of conjecture? Here is just one definition I found by googling: ... | |
| fractions | 11/4/2010 |
| Q: attached is a scanned copy of my math equation. thank you A: Lisa~ I can barely see your scan! To multiply two mixed numbers without making them into improper ... | |
| Binomial Theorem applied to complex numbers | 11/3/2010 |
| Q: I am having an issue using the binomial theorem to expand and simplify this complex number. I have ... A: Page~ Here is the solution using the binomial theorem. The binomial theorem says: 4C0*2^4*(-i)^0 ... | |
| complex numbers | 11/2/2010 |
| Q: What would the graph look like for (3+2i)-(-7+5i)? Also for (3+i)(-3-4i)? ANSWER: Elizabeth~ ... A: Elizabeth~ For the problem I answered above the geometric representation is the point (10,-3). For ... | |
| linear equations | 11/1/2010 |
| Q: What volume, in millilitres, of a 60% hydrochloric acid solution must be added to a 100 ml of a 30% ... A: Shelly~ This is a problem in the category of rate, just like d = rt and you set it up in a similar ... | |
| Math | 10/30/2010 |
| Q: We badly need you help for our math exploratory project the given is (17^21)/7 we need to formulate ... A: Jade~ I am not sure what the goal is here but 17 is a prime number as well as 7 and 21 is composed ... | |
| Abstract Algebra | 10/28/2010 |
| Q: I was given a question as below which I do not understand what does it mean and need your help to ... A: Raymond I need to know if your notation is saying the quotient group Z2[x]/<x^3 + x^2 + 1>? Then you ... | |
| word problem | 10/26/2010 |
| Q: I have a word problem but I don't know if I'm correct. A king took 1/6 of the apples from a pile The ... A: Sabrina~ Let x = the number of apples, so the king did take (1/6)x [notice the use of parentheses). ... | |
| Homework | 10/25/2010 |
| Q: I need to do some homework quickly - Can you please help? It starts like this ... 2 arches (like ... A: Dianne~ The first thing you will need to do is write an equation that describes the arches. The ... | |
| math | 10/24/2010 |
| Q: A teacher needs 6 craft sticks for each student in a class for a project which algebraic expression ... A: Anita~ If s = the number of students and you need 6 craft students for each student then 6s equals ... | |
| Would truly appreciate your help with these questions! | 10/21/2010 |
| Q: There are three questions that I would really appreciate help with: 1. 2^x - 2^(x-2) = 3(2^13) ... A: Christine~ Factor #1: 2^x - 2^(x-2) = 3(2^13) 2^(x-2)[2^2-1] = 3(2^13) 2^(x-2) (4-1) = 3(2^13) ... | |
| math | 10/20/2010 |
| Q: I'm trying to find the function table rule where x=4,5,6,7,8,9 and y =24,31,38,45,52,59. can you ... A: Randi~ If the function is linear then these are ordered pairs and all you have to do is find the ... | |
| scentific notation | 10/18/2010 |
| Q: 1/wxz = 2/y w=4 x 10^-5, y = 7 x 10^-6, z= pi x 10^8 A: I m assuming you want your answer equal to x since you don't have an explicit value for x, so the ... | |
| Abstract Algebra | 10/15/2010 |
| Q: Can you clear my doubts on the following questions which I do not understand. I cannot figure out ... A: Raymond~ *I cannot figure out why when we map f:real number to M(R) given by f(r)=Matrix [0 0, -r ... | |
| proofs | 10/14/2010 |
| Q: Prove: For every x with 1 lessthatn or equal to x less than or equal to 4, x^2-5x+4 is less than or ... A: Sarah~ There's not much to prove here since there are only 4 instances to consider so just plug ... | |
| Revised question from last time | 10/13/2010 |
| Q: Suppose you deposit $400 in an account that earns 0.75 percent each quarter. You make no withdrawals ... A: SallyJane~ I = Prt => P + I = P + Prt will be the accumulated amount Where I stands for interest, ... | |
| precalculcus | 10/12/2010 |
| Q: (x-6)^2+8 need how to get x-intercepts ANSWER: Larry~ x-intercepts always occur where y = 0 so set ... A: (x-6)^2 = (x-6)(x-6) = x^2-12x+36 now add 8 getting x^2-12x+44 and set it equal to 0: x^2-12x+44 = 0 ... | |
| Math | 10/12/2010 |
| Q: The approximate distance it takes to stop a car, based on the speed the car is traveling, is given ... A: Sally Jane~ The first thing you need to do is determine which variable depends on the other. The ... | |
| Functions | 10/10/2010 |
| Q: How do I find the function that describes the path of a mark on a bicycle wheel that has a radius of ... A: On a circle with a radius of 2 you have x^2 + y^2 = 2^2 => that means that with x = cos t and y = ... | |
| Functions | 10/10/2010 |
| Q: How do I find the function that describes the path of a mark on a bicycle wheel that has a radius of ... A: Megan~ Think of the mark on the bicycle wheel as being on the circumference of a circle. This ... | |
| proportions | 10/10/2010 |
| Q: solve for x. t/y=x/w & R/x = F/T A: Joel~ For the first one, t/y = x/w ask yourself where is x and how can I get x by itself? Then ... | |
| Advanced Math | 10/8/2010 |
| Q: 6x^3+mx^2+nx-5 has a factor of x+1. When divided by x-1, it has remainder of -4. What are the ... A: Mike~ First let me tell you I never received an email with this question. I was out on the website ... | |
| algebra | 10/7/2010 |
| Q: solve the equation 4ax+by=11ab 8ax-5by=ab here are the choices a x=3a,y = 2b b x=2b,y =3a c x=3 b,y ... A: Jamiah~ Are you looking for a method to solve these or just for the answer that works? If you are ... | |
| MS-08: Quantitative Analysis for Managerial Applications | 10/6/2010 |
| Q: 3. From a set of 1000 observations known to be normally distributed, the mean is 534 cm and SD is ... A: Shankar~ I answered this in a previous post but I have cut and pasted it here for you. One ... | |
| linear algebra | 10/5/2010 |
| Q: Dudley is a health-conscious student whose diet consists entirely of fried chicken, pizza and ... A: Julie~ It is impossible to get the proper nutrition, i.e., the balanced diet eating any combination ... | |
| mathematical symbols | 10/2/2010 |
| Q: Rewrite the following using mathematical symbols: a. Q is equal to the set whose elements are a, b, ... A: Edward~ Q = {a,b,c} {1,3} not a subset of {1,4,3, 7} b = c 0 is not an element of { } Math Prof I ... | |
| Precalculus | 10/1/2010 |
| Q: A rancher with 600 ft of fencing wants to enclose a rectangular area and then divide it into four ... A: Kristin~ You either have 2l + 5w = 600 or 2w + 5l = 600. You are limited in the amount of material ... | |
| Pre Calculus | 9/30/2010 |
| Q: A real life example of a polynomial function A: dianalaura~ A cost, revenue, and profit function would amply satisfy this question. Let P(x) be the ... | |
| fith grade math | 9/29/2010 |
| Q: I have not done math in so long. Can you explain How to make a histogram of data using intervals ... A: Lynn~ Histograms are like bar graphs. So for the first bar it would run from 0 to 100, the 2nd bar ... | |
| Algebra | 9/28/2010 |
| Q: I can't figure this out. Could you be of some help? a is proportional to b. If a = 1/4 when b = 2, ... A: Nate~ a is proportional to b means that you have a ratio of a1 to b1 equal to a ratio of a2 to b2 ... | |
| math | 9/27/2010 |
| Q: what is the rule of negative powers A: Osama~ You bring the factor from the denominator that has the negative exponent uo into the ... | |
| matrix word problem | 9/22/2010 |
| Q: a theatre has a seating capacity of 900 and charges $4 for children, $6 for students, and $8 for ... A: Monica~ One of the first things you will want to do is define your variables: Let x = # of ... | |
| question | 9/18/2010 |
| Q: Question From a set of 1000 observations known to be normally distributed, the mean is 534 cm and SD ... A: Rehana~ I answered this exact question earlier in September. This is just a copy and paste. Is this ... | |
| Graph | 9/18/2010 |
| Q: Sketch the curve for y=|(x^2)-6|x|| A: I can't sketch the graph for you (this site doesn't have a drawing tool) but I can tell you how to ... | |
| Algebra | 9/13/2010 |
| Q: For an art project, you make a square print with a side length of 8 inches. You make a frame using ... A: Stacia~ This is your typical area of the larger (frame plus picture) minus the area of the smaller ... | |
| Abstract Algebra | 9/10/2010 |
| Q: I am facing difficulties on the topics in Rings. Can you help me to solve the following question and ... A: Raymond~ Ask yourself what is a unit? By definition if R is a ring with unity, the elements in R ... | |
| theory of numbers | 9/9/2010 |
| Q: How to prove that an irrational number raised the power of an irrational number results in a ... A: Suraj~ No, not all irrational numbers raised to irrational powers will be rational. In the case of ... | |
| theory of numbers | 9/9/2010 |
| Q: How to prove that an irrational number raised the power of an irrational number results in a ... A: Suraj~ I answered your original question as if you wanted to prove that any (every, all) irrational ... | |
| Algebra questions | 9/9/2010 |
| Q: If Rowan can mix 20 drinks in 5 minutes, Karen can mix 20 drinks in 10 minutes, and Amber can mix ... A: Rini~ t = time it takes for all 3 people working together to mix 20 drinks w = rt where w is a ... | |
| Confused | 9/8/2010 |
| Q: I have tried to figure out these examples and I can't can you show me please. Compute and simplify ... A: Jason~ I will work the first one out for you explaining each part: 4^-1 is the same as 1/4^1. ... | |
| algebra | 9/5/2010 |
| Q: given the linear system 2x-y=3 ax+by=6 find value of a and b such that the resulting system has a) a ... A: unique~ First let me apologize for taking this long to respond I haven't been near a computer but I ... | |
| Standard Deviation | 9/2/2010 |
| Q: From a set of 1000 observations known to be normally distributed, the mean is 534 cm and SD is 13.5 ... A: Naresh~ One standard deviation will encompass the values between 520.5 and 547.5. Two standard ... | |
| what is the value of a | 9/1/2010 |
| Q: the area of a trapezoid is A=(a+b)hdivided by 2 ifA=300,h=5andb=30 what is the value of a A: Oscar~ All you have to do is out in the numbers for each of the letters. Just put in A = 300 for ... | |
| algebra | 8/31/2010 |
| Q: How do i make a function table. f(X)=-x+2 f(1)=-1+2 ... A: Kylee~ It is unclear if you have a piece wise function or if you are just showing me the functions ... | |
| advanced algebra | 8/31/2010 |
| Q: How do I do domain, range and function from a graph? A: Martin~ I will need more information to answer this question. What graph are you referring to? The ... | |
| URGENT PreCalc Plumbing Problem | 8/30/2010 |
| Q: I need a really fast answer (by tomorrow) for this problem: A water pipe of fixed length L has a ... A: Maria~ I am not sure what diagram you are referring to but here is how you would show f(1/4 D) = ... | |
| Military Time | 8/29/2010 |
| Q: My business uses Military time for payroll. On occasion, staff will forget to clock out and I will ... A: Anna~ I answered this question but it must have gone to La La land. So here we go again: If the ... | |
| factoring. | 8/24/2010 |
| Q: (x^3-4x^2+x+6)/ (x+1) A: Kayla~ What is the question?? I can assume you need to factor the top and see if there is a factor ... | |
| math | 8/23/2010 |
| Q: 42 is divisible by which of the following numbers 14,8,5,9 A: Eric~ There are a lot of ways to answer this question. Just one of the many ways is to prime ... | |
| probability | 8/22/2010 |
| Q: Here is a few questions I cant answer and very confused on 1. Two numbers are randomly selected ... A: Jennifer~ Always start with one or two questions and show what work you have tried if you want an ... | |
| math | 8/21/2010 |
| Q: which equation means that 7 less than twice a number is -1 A: antoine~ First you need to give a 'name' to the unknown which in this case is 'a number' so let's ... | |
| Mathemarics Engineering | 8/19/2010 |
| Q: Can You please help me A complex signal encoder sends signals through the radio waves in the form of ... A: Joe, I will try to answer your question. I don't know much about radio waves but I do know how to ... | |
| Probability problem | 8/19/2010 |
| Q: Below is the problem of probability,a request for solution Q. Two Vaccum cleaner Sales man A & B ... A: N = no sale Y = sale Call A sells two cleaners event C The sample space is: NN = .6(.6) = .36 NY = ... | |
| Math | 8/18/2010 |
| Q: In advance thank you for answering my question. here my problem:If a car travels 5 and one half ... A: Guy~ If you want to know what 5.5mi/6min is, that can be figured out, however you can get a ball ... | |
| Combinations | 8/18/2010 |
| Q: a student has to answer 10 questions, choosing at least 4 from each of part A and part B. If there ... A: Nithin~ The only sums of 10 that fit the criteria are 4 + 6, 5 + 5, 6 + 4 You can think of the sums ... | |
| Math | 8/18/2010 |
| Q: In advance thank you for answering my question. here my problem:If a car travels 5 and one half ... A: Guy~ There are a number of ways to deal with this kind of problem but the easiest (I think) is to ... | |
| multivariable limits | 8/17/2010 |
| Q: i have a multivariable limit that im quite stumped on its f(x,y) = (y-x)*ln(x^2 + y^2), lim f(x,y) ... A: Jaime~ To use L'Hopital's Rule in an indeterminant form you need to make it 0/0 as the limit ... | |
| Geometry help | 8/15/2010 |
| Q: I hope you can help me solve these problems: I am supposed to describe in words the locus that ... A: Sara~ The first thing you need to know if what a locus is. It is just a location. A more specific ... | |
| Simplifying fractions and canceling | 8/14/2010 |
| Q: How do I simplify the fraction 4x/4x+8? I thought that the 4x in top and bottom would cancel out but ... A: Emily~ First things first. Write 4x/(4x+8). The way you have it written says something entirely ... | |
| how to attempt a problem | 8/13/2010 |
| Q: I want to know the method of solving this problem instead of using a calculator. question- Find the ... A: Karan~ This is a Chinese Remainder Theorem question. Typically the modulus's need to be coprime but ... | |
| Geometry help | 8/12/2010 |
| Q: I hope you can help me answer thisI need to prove : If an isosceles triangle has an altitude from ... A: Sara~ If you have an isosceles triangle then you have two congruent triangles. Please see the ... | |
| square o symbol | 8/11/2010 |
| Q: I have some problems to calculate with a square in the formula. Can you explain it's purpose? I ... A: Mike~ I am not sure what you mean by the square symbol? Are you saying the square root? Or are you ... | |
| Finding a Rule From a Function | 8/10/2010 |
| Q: x=-2, -1, 0, 1 y=-7, -4, -1, 2 A: Anytime you have x and y values, make them ordered pairs and then find the slope and then write the ... | |
| Minimun # of Elements | 8/7/2010 |
| Q: Suppose A ⊆ B. a. What is the minimum number of elements in set A? b. Is it possible for set B ... A: Lisa~ The empty set, denoted by ∅, is also a subset of any given set X. (This statement is ... | |
| Algebra | 8/5/2010 |
| Q: When solving a radical equation, how do we use the principle of powers to eliminate radicals? A: Tuwana~ What is the 'principle of powers'? I will be making an assumption that what you mean is if ... | |
| statistic | 8/4/2010 |
| Q: From a set of 1000 observations known to be normally distributed, the mean is 534 cm and SD is 13.5 ... A: What do you know about statistics? It is hard for me to help you with a question if you don't show ... | |
| algebraic methods | 8/3/2010 |
| Q: Are there infinite solutions to this problem or no solution at all? -3x-2y=2 -4y=4+6x A: Ty~ It would be helpful if you would tell me what level of math you are doing and what you already ... | |
| Calculus | 8/3/2010 |
| Q: Intersection of curves a. Does cos 3x ever equal x? Give reasons for your answers. b. Use Newton's ... A: Ashley~ Google Newton's method. Math Prof | |
| Math | 8/2/2010 |
| Q: evaluate: limit (90-x)secx x->90 can i have the answer for this problem? A: liyah~ Have you heard of L'Hopital's Rule? You will have to use it because you have the case where ... | |
| permutations/group theory | 7/31/2010 |
| Q: look at wikipedia, burnside's lemma. look at the blue bullet points. i can follow the argument but i ... A: Tony~ Ok I think I see where you need some clarification now... You can still picture that cube ... | |
| permutations/group theory | 7/30/2010 |
| Q: look at wikipedia, burnside's lemma. look at the blue bullet points. i can follow the argument but i ... A: I'm not quite sure what it is you want to know. Is it how there are 3 cubed ways to rotate 90 ... | |
| Trigonmetry | 7/29/2010 |
| Q: Given that sinα = 4/5, 0 <α<π/2 and sinβ = 5/13, π/2<β<π find the ... A: Kevin~ Since the sina is 4/5 and in the first quadrant that means cosa will be positive and using ... | |
| hello | 7/29/2010 |
| Q: i have a problem answering this series: 1,2,6,42,1806,___ can you help me find the next series and ... A: This is a sequence of numbers. If you look closely for a pattern you will see that the first number ... | |
| Incline | 7/28/2010 |
| Q: I'm getting ready to run my first half marathon and there is a 125 ft climb over 1/2 mile. How do I ... A: Sara~ You will first need to change 1/2 mile into feet. There are 5280 feet in 1 mile so there ... | |
| polar equation | 7/28/2010 |
| Q: What geometric figure results from the following polar equation? Give the rectangular form of the ... A: Travis~ In polar coordinates r sin theta is just the y coordinate and r cos theta is the x ... | |
| Trigonometry | 7/27/2010 |
| Q: The irregular plot of land shown in the figure below (not drawn to scale) is being sold for $100 per ... A: Kevin~ First, I am so sorry for the late reply. I couldn't do this problem justice without ... | |
| Answer Check | 7/27/2010 |
| Q: 16. Write the equation in logarithmic form: 3Ö e = 1.40 ln 1/3 = 1.40 1.40 ln = 1/3 ln 1.40 = ... A: Victoria~ I can't follow your symbolism. What is Ö? Also, for example, #19 it is true that the ln ... | |
| Equations systems | 7/26/2010 |
| Q: I have 2 question regarding equations systems solutions 1 - Solve each system by the addition ... A: Khalid~ What are the questions? These are problems to be worked out and I don't have a clue ... | |
| Differentiability | 7/22/2010 |
| Q: I was confused by this problem; I know the function |X-1|(absolute Value) is not differentiable at ... A: Michael~ The absolute value function is really a piecewise function: f(x) = |x - 1| is the same as ... | |
| Algebra | 7/21/2010 |
| Q: Explain why 5/√2 is not simplified and demonstrate the steps we must take to simplify it. A: Tuwana~ The reason 5/√2 is not simplified is because you are not allowed to leave a radical ... | |
| maths | 7/21/2010 |
| Q: express area of circle as function of its circumference A: nisarg~ The area of a circle is pi*r^2 and the circumference of a circle is 2*pi*r. What level ... | |
| math | 7/19/2010 |
| Q: what is 25% of $100 A: Tanora~ The first thing you will need to get use to is that 25% is 1/4 or in words one-quarter ... | |
| Hello | 7/17/2010 |
| Q: Good day to you. I have three questions, is it possible to answer them for me. Q1: Write an ... A: For #1 I don't see a figure? #2: let x = selling price so the commission is .10x = .1x ... | |
| algebra 1 | 7/14/2010 |
| Q: Divide 3a^4 - a^3b - 15a^2b^2 +11ab^3 - 2b^4 by a^2 + 2ab - b^2 A: Do you know how to use polynomial long division? What about synthetic division? Synthetic division ... | |
| Gas Mileage | 7/13/2010 |
| Q: How much should charge my boss for gas mileage? I'm interning for free and she's offering me to pay ... A: Katherine~ I don't know what state you reside in but in California the state pays about $.42 a ... | |
| 1/x = x-1 | 7/12/2010 |
| Q: If 1/x = x - 1 what is x (or some possible values for x?) A: Rami~ You need to solve for x: x(1/x) = x(x-1)-> 1 = x^2 - x -> 0 = x^2 - x - 1 since it ... | |
| Complex numbers | 7/11/2010 |
| Q: Please can you help me to solve the following for Z: 1/Zt = (2/2+4i)-(1/1+5i)+(3/4+6i) t is just a ... A: Jaime~ For starters, 2/2 is 1 as well as 1/1 is 1 so the real part on the right is just 3/4. ... | |
| Trig Identities | 7/10/2010 |
| Q: I have a very difficult problem I am trying to solve and keep hitting a brick wall. If you can tell ... A: JanaLee~ Were you told to prove the identity or were you just suppose to find the value of ... | |
| Angle of elevation | 7/8/2010 |
| Q: For the question below, I am looking for the formula on how to set the problem up and solve. Thanks! ... A: x/140 = tan 48 deg, how do you get x by itself? What is attached to x? 140 and how is 140 attached ... | |
| Angle of elevation | 7/8/2010 |
| Q: For the question below, I am looking for the formula on how to set the problem up and solve. Thanks! ... A: Courtney~ The angle of elevation is just the angle you would look at if you were measuring from ... | |
| modulus function | 7/7/2010 |
| Q: Sir, can u pl explain me modulus function A: ADITYA~ The modulus function can be looked at in a number of ways. For the most part people ... | |
| vector math problem | 7/2/2010 |
| Q: can you help to solve this problem..??? can you answer this before july 5,2010? Draw the ... A: Maricom~ I can't draw the vector for you but I can describe what it will look like on an xy ... | |
| values of the three variables | 7/1/2010 |
| Q: How can I get the values of the three variables? 4a + 2b + c = 41 25a - 5b + c = 20 4a - b = 0 ... A: This is just a system of 3 equations and 3 unknowns. You probably have solved these through ... | |
| About cycles in graphs | 7/1/2010 |
| Q: 3 questions: 1) is ALWAYS true which a hamiltonian cycle with a odd number of vertices has a odd ... A: Manuel~ Since the number of vertices is an odd number let the number of vertices be 2n-1. This ... | |
| hi | 6/30/2010 |
| Q: can you teach me if how to complete the area of the triangle. A: Marijhel~ Please help clarify what you mean by complete the area of a triangle. Do you mean ... | |
| Chinese Remainder Theorem | 6/29/2010 |
| Q: I've been searched and thinked a lot about this theorm (Chinese Remainder Theorem) but I can't ... A: If you have 9 cong 3 mod 3 this translates as 3|9 (here I am using | for the concept of divides) ... | |
| Chinese Remainder Theorem | 6/29/2010 |
| Q: I've been searched and thinked a lot about this theorm (Chinese Remainder Theorem) but I can't ... A: I'm not sure what your question is here. 1 cong 1 mod 1 isn't very useful since any integer is ... | |
| Trigonometry help | 6/29/2010 |
| Q: my name is Brianna and I'm needing advice on a math class I'm starting tomorrow. As far as I can ... A: Brianna~ Wow what a mouthful. I am actually teaching a Trigonometry course this fall and I ... | |
| About eulerian/hamiltonian walks/cycles | 6/28/2010 |
| Q: I just sent you a question about Chinese Remainder Theorem:I'm reading the answer and then I'll ... A: Manuel~ First off you say that an Eulerian path means each vertex is distinct but an ... | |
| Chinese Remainder Theorem | 6/24/2010 |
| Q: I've been searched and thinked a lot about this theorm (Chinese Remainder Theorem) but I can't ... A: Manuel, help me out here please. What do you mean by 'ig'? Also provide me with a specific problem ... | |
| equivalance relation | 6/23/2010 |
| Q: if A={a,b,c} then the relation on A X A R={(a,a),(b,b),(c,c)} is equvalance relation. sherry ... A: In order to be an equivalence relation three properties have to be satisfied: reflexive, symmetric, ... | |
| radical equations | 6/22/2010 |
| Q: y^2/3 + 9y^1/3 + 8=0 A: Kani~ I am assuming you want(y^2)/3 + (9y)/3 + 8 = 0 by the way you have written the problem but ... | |
| math | 6/21/2010 |
| Q: 3y+xy=2x+1 A: What is the question? Are you suppose to solve for x or y? Are you doing implicit differentiation?? ... | |
| Sets,relations and functions | 6/18/2010 |
| Q: given A=(2,3,5,7),B=(1,12,13,15) How many elements are there in A cross B and B cross A.Is A croos B ... A: I am assuming you want to find the Cartesian Cross Product and if so, then you are looking for the ... | |
| explanations | 6/13/2010 |
| Q: Please, explain in brief in the following questions. ... A: maybe correlation variance?? You need to show me how you are obtaining your answer for the sample ... | |
| explanations | 6/12/2010 |
| Q: Please, explain in brief in the following questions. ... A: Yankgun~ A. add up the numbers and divide by the number of elements B. The variance is found by a ... | |
| add-on explanations | 6/12/2010 |
| Q: Please, explain in brief so that I can understand how come the answers are 117.5 / 6 / 10.25, ... A: Yankgun~ For number one without seeing the distribution I can't tell you why the upper class ... | |
| Hello, Need Geometry Help ASAP! | 6/11/2010 |
| Q: I've had a problem that has completely baffled my mind over the past few days, and I would like to ... A: Charles, have you made an error in your image? You have x^2 x 10, did you mean x^2 + 10?? Math Prof ... | |
| Need Geometry Help Urgently! | 6/10/2010 |
| Q: and good evening. My name is Charles, and I am an 8th grade student taking Honors Geometry. I need ... A: x is the geometric mean of 4 and 16. Sometimes the geometric mean is called the mean proportional. ... | |
| length calculation | 6/8/2010 |
| Q: I need to calculate the length of bobbin. A paper of thickness 0.038mm is winded over a core of ... A: Kaleem~ If I understand you correctly you just want to know the length of the material that is ... | |
| Geometry | 6/7/2010 |
| Q: How many circles of a same diameter can be fitted in a rectangle Please provide a simple formula ... A: Interesting speculations...If you wanted to put in a row of drums and get let's say 4 across each ... | |
| request | 6/7/2010 |
| Q: sherry wallin sir. I am always confusion about the one to one crosspoundece function and what is the ... A: I think what you meant is what is a one-to-one correspondence. A one-to-one correspondence is also ... | |
| Geometry | 6/7/2010 |
| Q: How many circles of a same diameter can be fitted in a rectangle Please provide a simple formula ... A: I actually did provide you a formula...divide the length of the rectangle by the diameter of the ... | |
| Geometry | 6/5/2010 |
| Q: How many circles of a same diameter can be fitted in a rectangle Please provide a simple formula ... A: Rahul~ There must be more to the question than this. Are you talking about exactly fitting as ... | |
| Future Value | 6/2/2010 |
| Q: Question from Kenneth: Hello: I have a question regarding the following compound interest and ... A: No, it is not as simple as adding P + rP for each additional year. For example, I have shown you ... | |
| Future Value | 6/2/2010 |
| Q: Question from Kenneth: Hello: I have a question regarding the following compound interest and ... A: I am going to try to explain how you would develop the pattern and then simplify it for you. P is ... | |
| 2 math problems | 6/1/2010 |
| Q: I need to find out why and how of a math problem (seemingly basic) that I just can't figure out on ... A: Mike~ When you change from dollars to euros and the rate is 1.3 euros for each dollar you are ... | |
| pre calc | 5/31/2010 |
| Q: A surveyor determines that the distances from a house to each of the endpoints of the diameter of a ... A: Ann~ If I assume that the house is on the edge of the lake then that gives me a triangle with ... | |
| Applying quadratic equations | 5/30/2010 |
| Q: My son is having difficulty applying quadratics. The problem is, a complex has 100 units(D)-when the ... A: One way to write a relationship between D and C is to write individual equations in terms of another ... | |
| Vectors | 5/27/2010 |
| Q: Find the magnitude of w to three significant digits and its bearing to the nearest tenth of a ... A: Allison, I will explain how to do a couple of these problems but it would be helpful if you showed ... | |
| Logarithmic equations | 5/24/2010 |
| Q: Log9x + 3log3x = 14. 9 and 3 are bases A: Sorry it has taken me so long to repsond but I didn't have internet access, just my celly.Anyway ... | |
| bionmial threom | 5/23/2010 |
| Q: (a+b)^5=C(5,0)*a^5+C(5,1)a^4 *b.......+b^2 sherry pls please decsribe the the first nd second term. ... A: Do you know what Pascal's Triangle is? 1 1 1 1 2 1 1 3 3 ... | |
| combinations | 5/22/2010 |
| Q: question- a set of three symbal {a,a,b}.find the the number of way these can be arranged. ... A: Ask yourself how many ways the first position can be chosen and you would say there are 3 things to ... | |
| mathematics-modulus function | 5/12/2010 |
| Q: ex.modulus of 3x+4=1. we write as -(3x+4)=1,and (3x+4)=1.but modulus of any value is always ... A: Andrew~ You are assuming that -(3x+4) is negative because of the minus sign, but what if x is a ... | |
| Vtot | 5/9/2010 |
| Q: I am stuck ! Can u help ? Calculate the total sum of voltages, Vtot, of the following voltages ... A: Neil~ Notice the coefficients of kinetic and static friction are both less for the steel on dry ... | |
| Sphere | 5/9/2010 |
| Q: How is the sphere surface and the diameter formule? A: Mario~ It is difficult for me to understand what your question is. Are you asking me how is the ... | |
| roof calcs | 5/8/2010 |
| Q: I want to calculate the length of the ridge board for a roof. The total length is 6m and width is ... A: Ok, hopefully this makes sense to you. The hypotenuse of the roof pitch is as you calculated 3.536, ... | |
| roof calcs | 5/7/2010 |
| Q: I want to calculate the length of the ridge board for a roof. The total length is 6m and width is ... A: It took me a moment to figure out what it is that you don't know. Basically you have a right ... | |
| Vtot | 5/6/2010 |
| Q: I am stuck ! Can u help ? Calculate the total sum of voltages, Vtot, of the following voltages ... A: sin(x+y) = sin x cos y + cos x sin y and sin(x-y) = sin x cos y - cos x sin y and with that said it ... | |
| Quadratic? | 5/4/2010 |
| Q: A dog owner wishes to enclose a rectangular area in his backyard for the dog. The owner wishes to ... A: Nick~ The reason that x + y = 14 is because you have two unknown measurements and 14 meters of ... | |
| identity proof- further pure 2-A2 | 5/3/2010 |
| Q: i am stuck on an identity question, which is as follows... Use the identity tan(A-B) = (tanA - ... A: Jason~ This is not Ahmed, it is Math Prof. Now let's look at the identity tan(A-B) = (tanA - ... | |
| Math | 5/2/2010 |
| Q: Rewrite the following using mathematical symbols: a. P is equal to the set containing a, b, c, and ... A: It would be helpful to me if you would try to explain to me what you do understand and what it is ... | |
| euler's identity | 5/1/2010 |
| Q: so euler says e^(i*pi)+1=0 so ln (e^(i*pi)+1) = -infinity so I don't understand why ln (e^(i*pi)+1) ... A: Hamad~ Really? You think that e^(ipi)+ 1 is a very small number? Well, it is certainly at least ... | |
| euler's identity | 5/1/2010 |
| Q: so euler says e^(i*pi)+1=0 so ln (e^(i*pi)+1) = -infinity so I don't understand why ln (e^(i*pi)+1) ... A: ln[e^(i*pi)+1] = ln 0 but since you can't take the ln of 0 you can examine what happens as you get ... | |
| Math | 5/1/2010 |
| Q: I hope you are able to help me with this problem it is stressing me out!! Thank you in advance for ... A: Danielle~ The goats won't go swimming to the other side?? LOL So you have three sides and ... | |
| Modulus | 4/30/2010 |
| Q: [x-1] + [2x+3] = 2 find x [] stands for modulus ANSWER: What mod are you using? If x = 1 and the ... A: Ok, here in America we just use vertical bars to talk about absolute value, so the problem would ... | |
| Logarithm- Math | 4/30/2010 |
| Q: what is the x intercept when your dealing with: y= Blog(baseC)AX ? A: I prefer to write logarithms such as yours as: y = blog_c (ax) where the underscore '_' is used as a ... | |
| Truth Table | 4/25/2010 |
| Q: Q#1 Formulate the argument symbolically and test its validity using truth table. Also mention ... A: Mahvish~ I can help with Q1 this way: Let P = John studies hard; Let Q = John gets A's; Let ... | |
| Calculas II | 4/25/2010 |
| Q: Question # 01: Rectangular co-ordinates of a point are . ( 3, 3, -3√3 ) a. Convert ... A: Vampire? rho = 3*sqrt 5 S = 3*sqrt 2 phi = arccos(-3*sqrt3/(3*sqrt5))= ... | |
| Math | 4/23/2010 |
| Q: Romel has two quarts of a 21% acid solution and three pints of a 35% solution. If he mixes them, ... A: Jill, this problem lends well to making a table of values: First let x = the resulting concentration ... | |
| Probability - Using multiple rolls of the dice | 4/22/2010 |
| Q: Using five standard dice, I roll the dice looking for sixes. Each six rolled is set-aside, and the ... A: There are 5 dies and there is a probability associated with each die on each roll. For each die ... | |
| Algerbra | 4/22/2010 |
| Q: The length of a rectangle is four times it's width. If the length is decreased by 12 meters and the ... A: Braydon, please don't use a follow up with a new question, thanks. To solve an equation in terms of ... | |
| Algebra | 4/21/2010 |
| Q: Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. ... A: This is a w=rt problem where filling the pool is 1 job and each person contributes their own rate ... | |
| math | 4/20/2010 |
| Q: What is the largest perfect square that divides into 731808 with no remainder? A: Irina~ One way to do this problem is to prime factor 731808 and then use the largest product of ... | |
| Algerbra | 4/19/2010 |
| Q: The length of a rectangle is four times it's width. If the length is decreased by 12 meters and the ... A: In every word problem the first thing you want to do is to determine what it is you are looking for ... | |
| Help Please | 4/19/2010 |
| Q: I'm not sure if it matters what degree the "angle on depression" has to be... This is a question in ... A: One definition of the angle of depression is: the angle of depression is the angle between the ... | |
| Discrete Structures | 4/18/2010 |
| Q: A, B, and C are subsets of a set S. Prove the following set identity using the basic set of ... A: I still don't know what your basic set of identities is but this is how I would do the problem. ... | |
| Quadrilateral Equation | 4/18/2010 |
| Q: I would be very grateful for some help please. I am stuck on an equation and despite my best ... A: Gsry~ You are right a quadrilateral has 4 sides and 4 interior angles. You are given a ... | |
| Discrete Structures | 4/17/2010 |
| Q: In the questions below determine the size (i.e. cardinality) of the set. 5 points (1 point each) • ... A: Ashley~ {x|x ∈ N, x2 < 10}-> this doesn't make any sense, is there a typo here?? I will ... | |
| math | 4/17/2010 |
| Q: Having problems coming up with a rule for the following x and y factors: x: 1,2,3,4,5,6 y: ... A: Barbara~ What I see is that x increases by 1 while y increases by the sequence 1+2+3+4+... From ... | |
| Discrete Structures | 4/15/2010 |
| Q: A large pile of coins consists of pennies, nickels, and quarters, at least 30 each. How many ... A: Ashley~ One way to figure out a question like this is to use smaller numbers and see if you can ... | |
| trig equations | 4/13/2010 |
| Q: what is 4sinsquaredx-3=0 in (0,360 degrees) A: 4sin^2x -3 = 0 -> 4sin^2x=3 -> sin^2x = 3/4 -> sin x = +-sqrt(3)/2 so you want to know what angle(s) ... | |
| number theory | 4/12/2010 |
| Q: I am trying to understand why e^ipi=cos(pi)+isin(pi)...I get that cos pi=-1, and that isin pi=0 ... A: Dave~ You are right in everything you say. Euler's identity is e^ipi + 1 = 0 and it is derived ... | |
| e and ln | 4/12/2010 |
| Q: I can't find the rules with how to deal with this type of problem anywhere: ln(e^2x-e^3x) I am ... A: Amber~ Rewrite ln(e^(2x)-e^(3x)) as ln([e^(2x)](1-e^x)). Note this is a product and the log of ... | |
| Discrete Structures | 4/9/2010 |
| Q: Prove that A ⊆ B if and only if A ⋂ B’= ∅ A: Ashley~ I answered this question yesterday but it is showing up again delivered today. I hand ... | |
| math | 4/9/2010 |
| Q: Solve the following equation by finding all of its roots: (x^2 - 2x - 15)(x - 4)=0 A: Anthony There is a zero product rule that says if you multiply two numbers together and their ... | |
| maths question please? | 4/8/2010 |
| Q: can you work something out what initial investment do I need to make to get an annual return of ... A: Simon~ Might I assume that you mean the interest rate is 6% and that the inflation rate is 3%? ... | |
| Discrete Structures | 4/7/2010 |
| Q: 11. Let A={x│x∈ N and 1<x<50} B={x│x∈ R and 1<x<50} C ={x│x∈ Z ... A: For part a you want to ask yourself if every element in the set A is also in the set B. The set A is ... | |
| math | 4/6/2010 |
| Q: Using the factor theorem, find the prime factors of the polynomial x^3+5x^2+2x-8 A: Anthony~ I'm not sure what 'factor theorem' you are referring to. In the text you use what do ... | |
| math | 4/6/2010 |
| Q: 5[5a-a(3x+5)+ x(a+2x)]- 10x^2 Remove all grouping symbols and combine like terms in the following ... A: First you will want to simplify in the inner most parenthesis: 5[5a-3ax-5a+ax+2x^2] - 10x^2, next ... | |
| One-Sided Limits | 4/5/2010 |
| Q: http://s763.photobucket.com/albums/xx275/trinhkieu888/?action=view¤t=12_03_17.gif Here is my ... A: From the graph you can see that as x->-2 from the left that it is not defined at x = -2 (because of ... | |
| Trig identities | 4/5/2010 |
| Q: I could not find a clear path to the solution of this problem. show: (cosx/1+ sinx)= (1- sinx/cosx) A: Please see attached | |
| Calculus II | 4/4/2010 |
| Q: I will post the entire question and then explain my dilemma. Suppose that f, g are positive ... A: In your example you said: 2^x^2 >> x^x because, ln(2^x^2) >> ln(x^2) therefore x^2ln(2) >> xln(x) ... | |
| Circles | 4/2/2010 |
| Q: Write the equation of a circle in standard form with a center at (-10,-5) and passes through the ... A: Jordan~ The standard form of a circle is (x-x_0)^2 + (y-y_0)^2 = r^2 where (x_0,y_0) is the ... | |
| trig | 4/1/2010 |
| Q: Solve tansquaredx - secx = -1 given that 0<= x < 360 A: There are a number of ways to solve this. The way I solved it was to change everything into cosines: ... | |
| math | 3/30/2010 |
| Q: -1 < log_3^y < 1 => -3 < y < 3 please explain it A: Pratap~ Basically the statement says that if the log base 3 of y is between -1 and 1 exclusive ... | |
| Pascal's Triangle | 3/29/2010 |
| Q: We're doing a very large report on Pascal's Triangle and I know the Triangle is packed with so much ... A: Mary~ If you look at the first (top) row of PT (Pascal's Triangle), 1 is the coefficient for ... | |
| pre-calculus | 3/28/2010 |
| Q: I am having a difficult time trying to answer these questions: A) 2sin^2-5sinx+2=0 ... A: Cierra~ It would be helpful if you would show me how you begin to do one of these problems so ... | |
| distance problem | 3/25/2010 |
| Q: There is a central office located between two work sites with two teams. The distance between the ... A: Building a table to organize the information is sometimes helpful: team# d r t ... | |
| Probability | 3/24/2010 |
| Q: Hope U R fine..I would really appreciate if u could help me with this question! A survey showed ... A: Let's label your 2 questions as question 1 and question 2. This is a union and intersection type ... | |
| Proving trig. identities | 3/22/2010 |
| Q: Can you plaese help me verify the following identity? (3sinQ-2cos^2Q)/2+sinQ = 2sinQ-1 A: First Jim you need to write the problem more clearly...is it (3sinQ-2cos^2Q)/2 and then add sinQ or ... | |
| permunation | 3/20/2010 |
| Q: ((n-r)!/(n-6)!)=30 (n-5)(n-4)=30 n^2-9n-10=0 (n-10)(n+1)=0 n=10 please explain it A: Pratap~ The problem is to find the value of r given all the other information (I think). You are ... | |
| fibonacci | 3/18/2010 |
| Q: Show that F_n+3 + F_n =2F_n+2 and F_n+3 - F_n =2F_n+1 Could you please explain to me of how to do ... A: ancy~ F_n+3+F_n = (F_n+2 + F_n+1) + F_n since F_n+3 = F_n+2 + F_n+1 = [(F_n+1+F_n)+F_n+1]+ F_n ... | |
| solve for Θ: | 2/15/2010 |
| Q: can you please help insolving 2 cos² Θ - 1 +cos Θ + 1 = 0: -360° ≤ Θ ... A: Freddie, simplify your equation 2 cos² Θ - 1 +cos Θ + 1 = 0 -> 2 cos² Θ +cos Θ ... | |
| infinite limit | 2/14/2010 |
| Q: lim (1/x)=INF where x->0+ (i have used "INF" to indicate infiniti please explain it A: When dividing by a very LARGE number the result is very small,and when dividing by a very small ... | |
| interval notation | 2/12/2010 |
| Q: simplify x-|x-x^2|, -1<=x<=1 let y=x-|x-x^2| ` now |x-x^2|=x-x^2 >=0 i.e. if x(1-x)>=0 i.e. ... A: now |x-x^2|=x-x^2 >=0 i.e. if x(1-x)>=0 (1) i.e. if x(x-1)<=0 (2) i.e. if ... | |
| limit | 2/12/2010 |
| Q: Using epsiln - delta defination prove that lim(x^2+2x-8)=7 (where x tends to 3) soluction let ... A: Pratap~ As x tends to 3 it is either coming from the left or the right. If it is coming from ... | |
| Solving the following | 2/10/2010 |
| Q: 1.2sin^2-sinx-1=0 2. 4sin^3x+2sin^2-2sinx-1=0 A: 1.2sin^2-sinx-1=0 Just factor it: instead of sin x let y = sin x and now you have through ... | |
| algebra | 2/10/2010 |
| Q: The weight of a bass varies jointly as its girth and the square of its length. A prize winning bass ... A: Sammy~ let w = weight and g = girth and L = length, to say weight varies jointly as girth and ... | |
| real number | 2/9/2010 |
| Q: if 'a' and 'b' two real number if a > 0 then -a < 0 proof:- a > 0 a-a>0-a 0>-a if a < 0 then -a ... A: Pratap~ This problem has been bothering you for some time. I remember this from about 6 months ... | |
| intersection point | 2/4/2010 |
| Q: How would you solve this in terms of n, I have been trying to solve this for approximately 2 hours ... A: When I solved for n and got n = [log A - log 800]/log(1.7) I was solving for n (but A is still in ... | |
| Solving an equation | 2/3/2010 |
| Q: I want to solve for n in the following problem 11800=10,000*(1.01^n) + 10n I know how to solve ... A: I don't think it can be solved explicitly because when you take the ln of both sides of the equation ... | |
| Solving an equation | 2/3/2010 |
| Q: I want to solve for n in the following problem 11800=10,000*(1.01^n) + 10n I know how to solve ... A: 11800=10,000*(1.01^n) + 10n is what you sent originally, what you have sent now is: 11800 = ... | |
| Pre-Calc | 2/1/2010 |
| Q: My original equation was (secx-tanx)(cscx+1). I distributed and all that. I got secx cscx + secx- ... A: There is no 'equation' here. There needs to be an equals sign in order to have an equation. You ... | |
| Calculation | 1/31/2010 |
| Q: Is calculation (1) the same as calculation (2)? (1) Tax = Assessed value X (Mills per $1)/$1000 ... A: According to this website mills is the tax per thousand dollars of assessed property value. So for ... | |
| Math Problem | 1/31/2010 |
| Q: I wanna ask one question....... I have given 16 numbers. 9999 5555 3333 1111 We have to add any six ... A: Do you know that there are 74,613 different possibilities of summing 6 numbers? Do you really want ... | |
| Calculation | 1/31/2010 |
| Q: Is calculation (1) the same as calculation (2)? (1) Tax = Assessed value X (Mills per $1)/$1000 ... A: Kenneth~ The word 'per' in mathematics many times means divide or "/". Any number can be ... | |
| input-output rule | 1/27/2010 |
| Q: I'm trying to find the value for y when I am given the value for x. The data I have is input(x) ... A: Kristi~ Write these as ordered pairs (points) and choose any two to find the slope and when you ... | |
| natural domain of a trig function | 1/26/2010 |
| Q: What is the natural domain of the function f(x)=cos(x+pi)? A: The natural domain is just the values for which the function f(x) is defined. Since trig functions ... | |
| Calculus | 1/25/2010 |
| Q: complete the algebra to simplify [f(x+Δx)-f(x)]/Δx to 4x+2Δx-3 for the function ... A: Let's call Δx = z so we want to show [f(x+z)-f(x)]/z is 4x+2zx-3 With f(x) = 2x^2-3x we have ... | |
| Mathematical Formula Required | 1/22/2010 |
| Q: Is there a method using math to analyze the best time to replace a vehicle? A: Yes and no. It depends on the vehicle and it's data of performance and reliability. In general ... | |
| intersection point | 1/21/2010 |
| Q: How would you solve this in terms of n, I have been trying to solve this for approximately 2 hours ... A: Bob~ Since you have labeled this problem 'intersection point' I assume you want to know the ... | |
| math | 1/20/2010 |
| Q: 1. #68a plane with an airspeed of 450 miles per hour is flying in the direction N35degW. Round ... A: When wanting help with questions, try explaining what you have tried and what you don't understand ... | |
| Equation | 1/18/2010 |
| Q: Find the value of k in the following equation: [9.e^(-6.k) ] - [9.e^(6.k)] + [7.e^(12.k)] - 7 = 0 ... A: This is really a 'factor by grouping' kind of problem. I'll try to walk you through it step by ... | |
| square root | 1/17/2010 |
| Q: I'm trying to find the answer to this equation(-5-square root-9)2 A: there is no equation here. In order for there to be an equation you must have an equal sign. Maybe ... | |
| Distance | 1/16/2010 |
| Q: A hiker climbs a trail at 2 mph and descends the same trail at 5 mph. He starts at 12:00 pm and ... A: I love helping students answer questions but I also need to know what you have already tried so I ... | |
| Trig Help | 1/15/2010 |
| Q: How do I prove that -1 ≤ sinΘ ≤ 1 and that -1 ≤ cosΘ ≤ 1? I'm ... A: Here is one way of dealing with the problem. On the unit circle you can use the idea that x = cos ... | |
| Calculus | 1/11/2010 |
| Q: As the Questions are written with the help of Equation editor, so image of questions file is ... A: Bilal~ For the first question you want to take the first derivative and divide the number line up ... | |
| Help with graphing functions and finding difference quotient | 1/9/2010 |
| Q: I am studying for my Pre-Cal midterm and need help with 3 problems. For problems A & B I have to: ... A: Make a table of x values and then calculate what y would be for each x and then plot the points and ... | |
| advanced math | 1/5/2010 |
| Q: there were 50 nickels, quarters, and dimes in the pot. their total value was $6.40 there were four ... A: Each nickel has a value of $.05 and each quarter has a value of $.25 and each dime has a value of ... | |
| I need help on some trig problems please. | 1/4/2010 |
| Q: I need to find the ArcCos1, ArcSin(-1/2), and ArcTan(-radical3/3) I have more problems but dont ... A: Melisa~ When you take the arcsin x or the arccos x or the arctan x you are asking yourself what ... | |
| ellipse | 1/3/2010 |
| Q: how do you graph the ellipse (y+11)^2 over 144 + (x-5)^2 over 121 =1? A: Your major axis is your y axis because 144 > 121. a is 12 so the vertices are at (5,-11+12) and ... | |
| Calculus | 1/3/2010 |
| Q: The image included shows the graph of the derivative of the function f; the domain of f is the set ... A: Look at the graph and wherever you can draw a horizontal line that only touches the graph in one ... | |
| Infinate Surds/Radicals-IB math more specific. | 1/2/2010 |
| Q: WHAT ARE INFINITE SURDS?! I am asked the followinga1=sqrt(1 + sqrt 1) a2=sqrt (1+ sqrt 1 + sqrt 1) ... A: Ca you calculate the first 10 terms of either? I think you have it written wrong by the way: Your a1 ... | |
| math | 12/30/2009 |
| Q: John is twice as old as his son. In 42 years, the ratio of their ages will be 4:3. What is the son’s ... A: Let x = the son's age so that the father's age is 2x. In 42 years the father's age will be 2x + 42 ... | |
| logarithmic and exponential equations | 12/29/2009 |
| Q: 1.) 9^(3x+1)= 7^x 2.) log(x-2)-log(x+4)=5 3.) log6(x+1)=log3(x-8) 6 and 3 are the base of their ... A: When the bases are not the same and they cannot be made the same then you have no choice but to take ... | |
| Pls. help me with the following equation, thanks. | 12/27/2009 |
| Q: Draw the graph of the function y = 2x2 + 3x – 3 between x = -6 and x = 5. By observation, where does ... A: Sam I assume you mean y = 2x^2 + 3x - 3. Set y = 0 which means you need to factor 2x^2+3x-3 = 0 -> ... | |
| Probability | 12/25/2009 |
| Q: Setswana Nosks estimates that the probability its lathe tool is properly adjusted is 0.8. When the ... A: I am not sure where you got your numbers. P(adjusted) = .8 which means the probability it is not ... | |
| symmertic relation | 12/23/2009 |
| Q: IF R be a relation on X (x,y) belongs to R then (y,x) belongs to R i.e if xRy then yRx called ... A: Take just one of the ordered pairs (a,a) and a is related to a (this is also reflexive). Is this ... | |
| number theorey for excercise | 12/21/2009 |
| Q: please help prove this exercises fully please explain 1.For any positive integer n,find lcm(n,n+1) ... A: Anndy~ #1 Regardless what n is, n and n=1 are right next to each other and one is odd and the ... | |
| volume word problem | 12/21/2009 |
| Q: A rectangular piece of cardboard is 2 units longer than it is wide. From each of its corners a ... A: Initially the length of the cardboard is w+2 and the width is w. When you removed the square pieces ... | |
| trigonometry | 12/19/2009 |
| Q: 1. solve the equation, tan=1 for the given interval of x. -pi/2 less than or equal to x less than or ... A: There is no such thing as tan=1, you must always have an argument for a function. You must have ... | |
| Trigonometry | 12/16/2009 |
| Q: Solve the Following Trigonometric Equations. Give All Positive Values of the angle between 0 degrees ... A: I will help you with C: Change cos(4x) into cos 2(2x) and use the identity: cos 2u= 1-2sin^2 u, so ... | |
| Math logic | 12/14/2009 |
| Q: What percent of the time is this statement true?: (A∧~B)∨~C A: Ashley~ That is a funny way to describe a truth table: A B ~ B ~C C (A & ~B) (A&~B) or ~C ... | |
| algebra | 12/13/2009 |
| Q: how do i solve variables on both sides? for example( -15+7t=30-2t) A: Sade~ Use the inverse operation to get all the variables on one side or the other. Try it this ... | |
| exponents | 12/10/2009 |
| Q: how to solve 1.45645=X^(.373) A: Kyle~ According to the law of exponents when you take a power to a power you multiply the ... | |
| Algebra | 12/10/2009 |
| Q: -2x – 6 < 4 provide the solutions. describe the circles and the shading for the graph. A: Lea~ When graphing on a number line we use open circles when we do not want to include the ... | |
| Business Math | 12/8/2009 |
| Q: I need to figure out the (1.) profit function (2.)partial derivative for x and y (3.)the best ... A: What is '$*' ? Is this suppose to be $8? Profit = Revenue - cost. Partial derivatives of x and y ... | |
| precal | 12/7/2009 |
| Q: how do u figure out what the general solutions for cos(theta)= -3/5? A: Meema~ What you really want to know is what angle theta gives you the cosine of it to be -3.5 ... | |
| Logarithms | 12/6/2009 |
| Q: How do you put a logarithm like log(base 6)5 into a graphing calculator? A: There are two basic types of calculators, one where you put in the argument first and ones that you ... | |
| Trig - Complex Equations | 12/6/2009 |
| Q: I need to convert the equations to trig functions then solve. Thanks for the help. A: I need to know precisely what it is you want to do. The word 'solve' means to find a solution and ... | |
| Algebra question | 12/5/2009 |
| Q: I have been presented with the problem x^3 + 6x^2y + 12xy^2 + 8y^3. I feel like the answer is right ... A: This is not a problem, it is an expression. You need to tell me what it is they want you to do. Is ... | |
| real analysis | 12/5/2009 |
| Q: Given a function f(x) = 0 if x is irrational = 1/q if x is rational and is ... A: Greg~ If you are looking at rational functions in their reduced form there are irrational ... | |
| Proofing a triangle | 12/4/2009 |
| Q: By using a right triangle with a base created From point A to pint B (point B is next to the ... A: Notice since m < BCA = 2T that m < CXB = 90-2T since triangle ABC is a right triangle. Also m < AXC ... | |
| Algebra 2 | 12/3/2009 |
| Q: D(3) = 30t + 15, find the domain and range A: The domain is your horizontal or independent variable values it can take on. Here that variable is ... | |
| Formula for circles that fit in a rectangle | 12/3/2009 |
| Q: I work at a paper mill and I am trying to find a formula that will help us calculate the number of ... A: OK I think I get the picture now. Essentially if the rolls are 72" then you will fit 72" + a 36" ... | |
| i realy, realy, realy need help | 12/2/2009 |
| Q: in school i am ahead in my math class so the teacher will usually give me more advanced work on the ... A: When the bases are the same we add exponents, example: 2^2 * 2^3 = 2^(2+3) = 2^5 = 32 you can check ... | |
| Formula for circles that fit in a rectangle | 12/2/2009 |
| Q: I work at a paper mill and I am trying to find a formula that will help us calculate the number of ... A: What is the length of each roll? How much overlap is there with each pair of rolls? What you have ... | |
| Geometry | 12/1/2009 |
| Q: An obtuse angle has a measure that is greater than 90 degree and less than 180 degrees. Using the ... A: Law of Detachment ( also known as Modus Ponens (MP) ) says that if p=>q is true and p is true, then ... | |
| i realy, realy, realy need help | 12/1/2009 |
| Q: in school i am ahead in my math class so the teacher will usually give me more advanced work on the ... A: Ben, one way to think of this is this: let's take a simple example in base 10: 10^1 = 10, 10^2 = ... | |
| algebra | 11/30/2009 |
| Q: Solve this system of equations: 200x+160y+60z=2100 400x+300y+200z=4500 x+y-2z=0 A: First things first, why not make these equations as simple as possible? You can divide out the GCF ... | |
| trig and probab | 11/29/2009 |
| Q: hey i have a couple of questions. frist is probability.1) spares of particular component are ... A: sin(A+B) = 2sin(A-B) use rules for sin of a sum and sin of a difference sinAcosB+cosAsinB = ... | |
| trig and probab | 11/29/2009 |
| Q: hey i have a couple of questions. frist is probability.1) spares of particular component are ... A: Sara~ lots of questions! 1/200 = .5% and 1/50 = 2%, these are the failure probabilities Since ... | |
| Set theory | 11/29/2009 |
| Q: A and B and C are non empty sets and E is the universal set. Given that: n(AnBnC)=3, n(A)=15, ... A: You might be better served asking another expert this question. Math Prof | |
| math | 11/28/2009 |
| Q: The nominal family took a trip to an apple orchard and picked 4 different types of ... A: Jacinta~ Let f = # of Fuji apples; c = # of Cortland apples; b = # of Braeburn apples; r = # of ... | |
| Mathematics, Trigonometry | 11/25/2009 |
| Q: Question1 :If x and y are acute angles and sin2x =cosy, find x in terms of y. Question2 :Determine ... A: J.A.~ Start with one side or the other and try to arrive with the opposite side. I will begin with ... | |
| Mathematics, Trigonometry | 11/24/2009 |
| Q: Question1 :If x and y are acute angles and sin2x =cosy, find x in terms of y. Question2 :Determine ... A: A~ For #1 I would do this: take the arcsin of both sides: arcsin(sin(2x)) = arcsin(cos(y)) 2x = ... | |
| Finite Math | 11/24/2009 |
| Q: (a) select appropriate variables; (b) write the objective functions; (c) write the constraints as ... A: Constraints are the boundaries of the problem. Like for instance the number of any item produced ... | |
| Pre-Calculus | 11/23/2009 |
| Q: I have a question on solving a function equation, its very simple it just gets me confused every ... A: Rene~ There are a number of ways to do this. One way is to put into English what the rules of ... | |
| Function Table (A) | 11/23/2009 |
| Q: I have a function table such as Input Output 0 4 1 7 2 10 3 13 4 16 6 25 8 9 34 64 40 I ... A: Amy, these are just ordered pairs (points in an x-y coordinate system). You can use any two points ... | |
| need asap help | 11/22/2009 |
| Q: Hey I can't figure these out, do we have enough info? 1)A lighthouse is located on a small island 3 ... A: For #1- the light is moving 4rev/min (constantly). Think of the lighthouse as being the center of a ... | |
| maxima and minima | 11/20/2009 |
| Q: pls help me with the following problems. 1) How to find the extreme values and test if they are ... A: for #1 What is m? Is it a variable or a constant? If it is a constant then take the first partial ... | |
| rules and function tables homework | 11/19/2009 |
| Q: rule: 6+a=b a b 2 10 15 ... A: Joey, what is that column of numbers? Is that suppose to be values for a? If so, simply take the 2 ... | |
| please help soon | 11/18/2009 |
| Q: do you know how to find the inverse of the relation {(3,-2),(4,0),(-5,-1),(-1,6)} A: "In mathematics, the inverse relation of a binary relation is the relation that occurs when you ... | |
| functions | 11/16/2009 |
| Q: If f(x-3)=x^3+2x^2+7x+1, determine f(x) I tried to divide x^3+2x^2+7x+1 by x-3, but my answer was ... A: What you want is a function that when you evaluate it at (x-3) you get x^3+2x^2+7x+1. Shift our x ... | |
| #3 Trig | 11/16/2009 |
| Q: I'm stuck and need some help. A: If P1 is on the wheel where it is shown and 2 seconds later P2 is at the top of the wheel then P1 is ... | |
| f(g(x) | 11/15/2009 |
| Q: I only have one problem that I don't understand: 6. Confirm that f and g are inverses of eachother ... A: Celia~ I like to think of finding the inverse as a game and part of that game is substituting ... | |
| advanced math | 11/15/2009 |
| Q: Pipe A leads into a tank, and Pipe B drains the tank. Pipe A can fill the entire tank in 10 minutes. ... A: This is a work rate type problem. You know in a work problem that the rate is 1 over the time so if ... | |
| rotating | 11/14/2009 |
| Q: Please help me. I want to know how to find the coordinates of a point on the circumference of a ... A: Klaus~ You are rotating clockwise 90 degrees, this means from the point (6,6) in Quadrant I ... | |
| Algebra II.....please help me its urgent!!! | 11/13/2009 |
| Q: 6.The magnitude and direction of vectors u and v are given. Find vector w's polar coordinates. u: ... A: Choose a few questions or I will address a couple. This site (as far as I am concerned) is for ... | |
| proofs | 11/12/2009 |
| Q: suppose that a and p are natural numbers and that p is prime. are there values of a and p where ... A: What does it mean to be the greatest common divisor? It means what is the smallest divisor that ... | |
| Equivalent Trignometric Functions | 11/11/2009 |
| Q: can you help me in this question please? It says choosing appropriate values for A and B, verify ... A: If you look at what happens in the first quadrant with the sine function and the cosine function you ... | |
| pre calc | 11/10/2009 |
| Q: the machine is baught for 1000 dallors and after 5 years value is 100 dallors find a formula for the ... A: This all depends on if the price depreciates 'linearly' which I am assuming it is so then you have ... | |
| trig | 11/9/2009 |
| Q: Directions- solve each equation for solutions over the interval [0*,360*] (*=degrees). Give ... A: What you gave me factors as (cos^2 theta - sin^2 theta) = (cos theta + sin theta)(cos theta - sin ... | |
| Function Rules | 11/8/2009 |
| Q: What is the function rule if x = 5, 10, 15, 20 (that is the easy part) y = 10, 5, 10, 15. I can see ... A: Penny~ Try plotting the ordered pairs (5,10), (10,5), (15,10), (20,15) to see what shape you ... | |
| Pre-Calculus | 11/8/2009 |
| Q: I need help with this problem, please: Suppose points A, B, and C have coordinates A (0, 0), B (1, ... A: u= (1-0,-2-0) = (1,-2) v= (4-1,2--2) = (3,4) cos x = u dot v/|u||v| = 1(3) ... | |
| Ratio | 11/7/2009 |
| Q: I have a ratio problem I solved it with 2 ways one I know to be mathematically correct but the other ... A: I just viewed the video and he is a good math teacher. You want to do what he did with pure math and ... | |
| Trig | 11/7/2009 |
| Q: I need help with this problem, please! Find the exact value of tan(sin^-1(-square root of 3 divided ... A: First things first. The sine of angle is a number but the inverse sine of a number is an angle. So ... | |
| Ratio | 11/6/2009 |
| Q: I have a ratio problem I solved it with 2 ways one I know to be mathematically correct but the other ... A: If you are starting with 5 apples and 8 oranges, then why would you begin letting a = total number ... | |
| implicit differentiation involving trig functions | 11/6/2009 |
| Q: heres the problem: cos(x+y) + sin(x-y) heres how i started: 1. -sin(x+y)*(1 + dy/dx) + ... A: Zachary~ Here is how I would do the problem: I prefer to call dy/dx y' until the end [cos(x+y)]' ... | |
| Ratio | 11/6/2009 |
| Q: I have a ratio problem I solved it with 2 ways one I know to be mathematically correct but the other ... A: Hamad~ About your 2nd method: first you can't have 13 fruits if you start with 5 apples and 7 ... | |
| pre claculus | 11/5/2009 |
| Q: how to list the transformations applied to parent function f(x)=x^4 to obtain g(x)=-2(x-3)^4+5 A: Beginning with the function f(x) = x^4 your g(x) is obtained by realizing that the leading ... | |
| algebra 2 | 11/5/2009 |
| Q: this is my problem: Ace invests $5000 in an account that earns 5% annually, compounded quarterly. ... A: Katharine~ t is time in years. The question could be for a 5 year period and in that case t ... | |
| logarithms | 11/4/2009 |
| Q: How would you combine logs with a different base?? My question is log base 3 (x) + log base 27 (x) = ... A: Katharine~ This is tricky but here goes. I am using _3 to indicate base 3 Using the following ... | |
| urgent math | 11/3/2009 |
| Q: Hey there I have a test tomorrow nigh for Calc and I just can't seem to get the answers for these ... A: #3 μ is called mu and is the greek letter mu. In physics we use it for a coefficient (constant ... | |
| urgent math | 11/3/2009 |
| Q: Hey there I have a test tomorrow nigh for Calc and I just can't seem to get the answers for these ... A: of course I can't answer all these questions so as you asked I'll pick a few to help you out: Let's ... | |
| Calculus: Implicit Differentiation | 11/3/2009 |
| Q: Use implicit differentiation to find the slope of the tangent line to the curve 4x^2+2xy–2y^3=8 at ... A: Sue~ I'm not sure what part has you lost but to do implicit differentiation it is just like ... | |
| remainder theorem | 11/2/2009 |
| Q: a cubic polynomial gives remainders (5x+4)and (12x-1) when divided by x^2-x+2 and x^2+x-1 ... A: Belle~ There are a number of ways to approach these problems. I think your teacher wants you to ... | |
| Prime Factorization | 11/2/2009 |
| Q: In how many zeros does 150! end? Show your reasoning. I am so lost by this question. A: check out 5! and 10! and 15! and 20! and you will find that each multiple of 5 adds a 0 so in 150! ... | |
| Calc - Optimization Problem | 11/1/2009 |
| Q: I've been working on the attached problem #6 and I'm getting stuck. Thanks for any help. A: You have a right triangle with one leg 4 ft and the other leg x ft so the hypotenuse is ... | |
| math | 10/31/2009 |
| Q: how to calculate this? (x-1.2)(x-1.3)(x-1.5) A: fzlan87~ You calculate this exactly the same way you would calculate (x-1)(x-2)(x-3). Use foil or ... | |
| Trig | 10/30/2009 |
| Q: I need help with this problem, please. Thank you! Find the vertex, the focus, and the directrix. ... A: First you need to determine what this is. Is this a hyperbola, an ellipse, or a parabola? Both ... | |
| Trig | 10/30/2009 |
| Q: I need help with this problem, please, I didn't get it correct when I submitted it. Thank you! ... A: Cindy, use the law of cosines: b^2 = a^2 + c^2 - 2ac*cosB -> b^2 = (23.78)^2 + (25.74)^2 ... | |
| Algebra II | 10/29/2009 |
| Q: Can you help me solve the following questions? 21. y²+400 = 0 22. 4z² + 39 = 7 23.(4 + i)(4 - i) ... A: Let me clarify something for you first. The word 'solve' means to find a value for a variable in an ... | |
| trig sum and difference formula | 10/29/2009 |
| Q: Use a graphing utility to approximate the solutions of the equation in the interval [0, 2π). If ... A: sin(2x) + cos(x) = 0 note this implies that sin 2x = - cos x. You could always change - cos x into ... | |
| math | 10/28/2009 |
| Q: which is greater ? 2/4 or 6/10 A: There are a couple of ways to approach this question. One is to reduce each and see what you have: ... | |
| Trig | 10/27/2009 |
| Q: I need help with this question, please: An airplane heads 60 at 350 miles per hour. Find ... A: The symbol after the 60 isn't coming across but to break the vector into components just do ... | |
| trig sum and difference formula | 10/27/2009 |
| Q: A weight is attached to a spring suspended vertically from a ceiling. When a driving force is ... A: It is not clear what 1.) is unless it is part (b) and if so then y = 2sqrt(1/6)+(1/4)sin(3t + 37) ... | |
| Algebra II | 10/26/2009 |
| Q: Cities A and B are located on an east-west highway at a distance of 244 mi from each other. A truck ... A: Janay~ Since the truck and the car are traveling towards each other, the distance each travels ... | |
| Vectors | 10/25/2009 |
| Q: can you, please, help me with this homework problem? Find the sum of u + v. Give the magnitude to ... A: Ok I think it is clear that you are to find the magnitude of the sum of u + v given the magnitude of ... | |
| Derivative | 10/22/2009 |
| Q: how would you solve this derivative Lim [cos(3.14/2+h) - cos(3.14/2)]/h as h aprroaches 0 A: Was the problem given this way or did you put in 3.14 for pi? And in the denominator of the first ... | |
| Math | 10/21/2009 |
| Q: I need to figure our how to get 5 problems to their simplest form: They are: 5x-^4; 3^6/3^3; ... A: Any time you have a negative exponent regardless of whether it is in the numerator or denominator, ... | |
| modeling functions and solving | 10/20/2009 |
| Q: A rancher with 600 ft of fencing wants to enclose a rectangular area and then divide it into three ... A: Let x = the length of the pen and y = the width of the pen. If the plot is divided into 3 pens with ... | |
| consecutive integers | 10/18/2009 |
| Q: please explain in detail the process of finding four consecutive integers that equal the sum of 18? A: amonpatah~ Choose one of the consecutive numbers to be x and then the next is x+1 and the next after ... | |
| mathematical economic | 10/17/2009 |
| Q: i am student of mathematical economic 201 i have few question i can not solve it can you help me to ... A: I can help you a little bit. I can't read the equation in part c and in part a you need to use the ... | |
| proof | 10/16/2009 |
| Q: could you plz give me a hint about the problem below: Use induction on the size of S to show that ... A: Bita~ You are looking at the characteristic of the set and namely that characteristic is the ... | |
| A couple questions | 10/16/2009 |
| Q: I have been having trouble with some probability questions and I was hoping you could help me out. ... A: Let me see if I can help you reason this problem out. If there were 2 kings in a deck of 10 cards ... | |
| calculus: limits | 10/15/2009 |
| Q: I'm having trouble solving this problem (see attach image). I know you can't use the direct ... A: Use L'Hospital's Rule for indeterminate forms: if lim(x->a) [f(x)/g(x)] = 0/0 this is an ... | |
| Abstract Algebra | 10/15/2009 |
| Q: prove that if p and q are distinct primes, then there exist integer m and n such that p*m + q*n = 1 A: The Euclidean algorithm finds for any integers a and b their greatest common divisor, d, i.e., ... | |
| mathematics | 10/14/2009 |
| Q: 1+tan^2 _______ 1-tan^2 ANSWER: What is it you want done with this Fasha? Usually instructions ... A: Fasha~ To verify you need to simplify both sides until you have the same expression on both ... | |
| Pre-cal | 10/14/2009 |
| Q: I am having a problem figuring out out to solve this problem the question is: Find the equivalent ... A: Is the problem (cscx/cscx)-cotx or cscx/(csc-cotx)? I am going to assume the 2nd. So proceed as ... | |
| mathematics | 10/13/2009 |
| Q: 1+tan^2 _______ 1-tan^2 A: Fasha I made an error that needs to be corrected so please bear with me and I will fix it for us: ... | |
| linear equations | 10/12/2009 |
| Q: "The manager of a fish store has water that is 10% salt and water that is 25% salt. He needs to fill ... A: This problem can be solved by using a table to organize the info: let x = # gal of 10% salt water ... | |
| Math 203 | 10/11/2009 |
| Q: #1 Given: Y=3x^4+2x^3+4 at P(X,Y) let Q be another point on the curve. #2 Differentiate:A: ... A: Let me see what I can answer for you here. The questions are still not clear although I see what you ... | |
| Algebra | 10/11/2009 |
| Q: Simplify the expression: 4/x^2 + 2/(x^2+x) Give your answer in the form of f(x)/g(x). For this ... A: Sue~ The common denominator is x^2(x+1) and the first term needs to be multiplied top and ... | |
| Math 203 | 10/10/2009 |
| Q: #1 Given: Y=3x^4+2x^3+4 at P(X,Y) let Q be another point on the curve. #2 Differentiate:A: ... A: Taneen, there is no question for #1. For #2 A just differentiate each term but put the variables on ... | |
| Advanced composition of functions | 10/9/2009 |
| Q: I'm using this computer system called ALEKS, and one topic is frustrating me to no end. As you see, ... A: Basically (fog)(x)=f(g(x)) which means that the domain will be the range of g(x).Think of it this ... | |
| Percent Equation | 10/7/2009 |
| Q: I need the definition of Percent equation and Compound Interest. I also need to find the terms to ... A: I don't know which formulas your text has there are many equivalent formulas. The terminology is ... | |
| pre-calc | 10/6/2009 |
| Q: how would you simplify this expression tanx(cscx-cotx) A: I usually tell my students to replace each term or factor with equivalent sines and cosines and see ... | |
| calculus-differentiation rules | 10/4/2009 |
| Q: Sherry, Here is an exact copy/paste of my actual problem. Let me know if you can help me with this. ... A: Ok the tangent line at any point has slope f'(x). (This is one interpretation of the first ... | |
| math | 10/3/2009 |
| Q: |a|>=a and |a|>=-a if a>=0 then |a|=a if a<0 then |a|=-a>a a belongs to R then |a|>=-a ... A: line 1 if a>=0 then |a|=a line 2 if a<0 then |a|=-a>a line 3 a belongs to R then |a|>=-a ... | |
| matrixes | 9/30/2009 |
| Q: Apply understanding of matrix multiplication A toy company in Seattle makes stuffed toys, including ... A: The numbers in your matrix are in minutes, and how would you convert those minutes to hours? You ... | |
| math | 9/29/2009 |
| Q: For every real number ε > 0, there exists a natural number n_0 such that for all n > n_0, |xn ... A: Pratap~ n_0 is a natural number which means it is a counting number and in this case it is ... | |
| Algebra II | 9/29/2009 |
| Q: How do you do: 5th root of 64x^6y^5z^12 A: The 5th root means you need to take every factor to the 1/5 power. So you have as factors ... | |
| Word problem | 9/28/2009 |
| Q: I have asked a few experts so far, no one has been able to help. Hoping to have more luck with you. ... A: John~ I can help you out a bit but bear in mind that I haven't studied this in over 20 years... ... | |
| math | 9/26/2009 |
| Q: This is question from absolute value properties Question |a|>= and |a|>=-a Proof: if a>=0 then ... A: First you need to be careful when you type in the problem because this 'a|>= and |a|>=-a' doesn't ... | |
| Calculus | 9/25/2009 |
| Q: Differentiate the function f(x)=2cos^5 3x+xlnx A: Let u = 3x so you have 2cos^5u +xlnx Let's take the derivative of each term since the derivative of ... | |
| Percentages | 9/24/2009 |
| Q: (A) 5% X $2000 = $100 (B) 2% X $1000 = $20 This is a total return or average of $120/$3000 = 4% ... A: Kenneth~ You want to figure out how much money needs to be put in account A at 5% return and how ... | |
| Input Output Tables- How to write a rule | 9/23/2009 |
| Q: I need to write a rule for this. input, x 10,11,12,13 and output, y 3,4,5,6,. I'm not sure how to do ... A: What is the change in y? What is the change in x? What is the slope of a line? The change in y over ... | |
| differentiation and integration | 9/22/2009 |
| Q: Question1 A projectile is launched at an angle from the horizontal. if air resistance is neglected ... A: Lorato~ First let me tell you some standards for writing what you wrote that might make your ... | |
| Function Tables | 9/22/2009 |
| Q: I am trying to figure out how to express the rules for two different function tables. In the first, ... A: RDC~ Here is a detailed solution to the first problem. Write the function as a set of ordered ... | |
| Graphing an Equation? | 9/21/2009 |
| Q: I need help with the STEPS (preferrably very detailed steps) on graphing the following equation (and ... A: Any time a number (term) is moved from one side of an equation to the other it changes the sign. For ... | |
| Differentiating, Integrating & Minimum/Maximum | 9/21/2009 |
| Q: Here are 4 more questions (you just answered one on graphing an equation for me!) I need ... A: Question #2: Given: E(a, be, c, d) = ac^2 + cb^2 + cb2 + 5d + 5a. Partially differentiate to find: ... | |
| Graphing an Equation? | 9/21/2009 |
| Q: I need help with the STEPS (preferrably very detailed steps) on graphing the following equation (and ... A: The first thing you need to notice is that there are only two variables and they have just the first ... | |
| solving absolute value inequalities | 9/20/2009 |
| Q: how do i solve the following problem: /x+3/-2<1 A: First get the absolute value by itself on one side of the equation: |x+3| < 3 Now use the rule ... | |
| polynomial & end behavior | 9/18/2009 |
| Q: without graphing,m describe the end behavior of the graph of the functions: f(x) = 3x^3 g(x) = ... A: These questions can be analyzed simply: for f(x) when x gets large what happens to x^3? It gets ... | |
| simultaneous equation | 9/18/2009 |
| Q: Leo is twice older than Martin and three times than Mike, if the sum of their ages is 33, what is ... A: There are probably a gazillion ways to solve this problem but my first attempt doesn't even use ... | |
| I need help. | 9/17/2009 |
| Q: I'm in College Algebra, it's exactly the same thing as Pre-Calculus. There are two questions that I ... A: Amber~ 1) First things first, you need to define your variable. You've used x. Define it to be the ... | |
| Algebra ll (sytem of equations with three variables) | 9/16/2009 |
| Q: How do i solve sytem of equations with three variables? x+5y+6z= -10 ... A: Mikey~ There are a number of ways and not knowing what level of math you have taken I will use ... | |
| literal equations | 9/15/2009 |
| Q: how do you answer these 3 questions E - F = G, for F -wr= a, for w tu= v + w, for u A: Joshua~ Literal just means solve for the named letter. E-F = G, just subtract E from both ... | |
| Definition of a limit | 9/12/2009 |
| Q: I am wanting to know if the definition of a limit below normally used is the best definition of a ... A: |f(x) − L| < ε means -ε < f(x) − L < ε which just means the the ... | |
| trigonmetry | 9/11/2009 |
| Q: prove that (sinA.sin2A+sin3A.sinA6A)/(sinA.cos2A+sin3A.cos6A)=5tanA ... A: Pratap~ You can't multiply the top of a fraction by 2 and not multiply the bottom by 2 also. ... | |
| math | 9/10/2009 |
| Q: prove that (sinA.sin2A+sin3A.sinA6A)/(sinA.cos2A+sin3A.cos6A)=5tanA ... A: Pratap, I think you meant to say: (sinA.sin2A+sin3A.sin6A)/(sinA.cos2A+sin3A.cos6A).The first line ... | |
| Algebra-Solving Problem | 9/9/2009 |
| Q: Find three consecutive integers such that twice the least integer is 12 more than the greatest ... A: Consecutive integers are 'next' to each other so if you let the first one be x then the next is x+1 ... | |
| Percentages & Interest | 9/7/2009 |
| Q: At simple interest, an investor divides $1000.00 into two accounts -- one account of $200 earning ... A: Ok Kenneth this makes a bit more sense! Your teacher wants a non-algebraic solution. There is always ... | |
| Percentages & Interest | 9/7/2009 |
| Q: At simple interest, an investor divides $1000.00 into two accounts -- one account of $200 earning ... A: Kenneth there are at least a couple of solutions to this problem. The one obvious (to me) is to earn ... | |
| pre-calculus | 9/6/2009 |
| Q: How would i write the equations of the parabolas with the following conditions: a. with ... A: Sorry Miranda for a late response. I wrote a solution and it went to website heaven...Here I will ... | |
| simultaneous equations | 9/6/2009 |
| Q: Sam has been saving 10 cent coins and 20 cent coins in a jar. When he takes the jar to the bank, he ... A: We don't have any 20 cent coins here in the U.S., do you in Australia? Let's pretend that there is ... | |
| math | 9/5/2009 |
| Q: sin(2A)=2sinA cosA =(2sinA cos^2A)/cosA =2tanA/sec^2A =2tanA/1+tan^2A please explain it. A: The 2nd line multiplies the top and bottom of the right hand side of the first line by cos A: [2sinA ... | |
| Word problem | 9/3/2009 |
| Q: Candy worth $1.25 a pound was mixed with candy worth $1.50 a pound to produce a mixture worth $1.35 ... A: Make a table of the information and decide what your variable is going to be and what it is going to ... | |
| Precalculus | 9/2/2009 |
| Q: Solve for the indicated variable (listed after the semicolon). Restrict all answers to the interval ... A: The first one is the difference of sin(x-y), so essentially you are looking for the value of x-y so ... | |
| math | 9/1/2009 |
| Q: please prove that cos(-x)=cosx A: The cosine is an even function which means that any time (x,y) is on the graph (-x,y) is also on the ... | |
| Long Division | 9/1/2009 |
| Q: ) I hope this is no bother to you but I'm getting ready to go into college and today I realized that ... A: This will be difficult to show you in a type set environment but I will try: In your problem you ... | |
| hi | 8/30/2009 |
| Q: how would you do this problem: (1/4) - (1/2) ÷ (1/3) can you show me step by step please? ANSWER: ... A: Raymond, I can see how you are confused. Do not always second guess yourself! The back of the book ... | |
| differentials | 8/30/2009 |
| Q: show that if z=x^nf(u) where u=y/x then: x(dz/dx)+y(dz/dy)=nz verify this result for ... A: Olivia~ In order to conclude that x(dz/dx) + y(dz/dy) = nz you must satisfy the hypothesis ... | |
| Pre-Cal | 8/30/2009 |
| Q: Suppose a = cos(20). Find the following in terms of 'a': 1) sin(20) 2) cos(70) I'm having trouble ... A: Sue Lee~ The sine of an angle and the cosine of an angle are related. I like to think of them ... | |
| hi | 8/29/2009 |
| Q: how would you do this problem: (1/4) - (1/2) ÷ (1/3) can you show me step by step please? A: Raymond, there are two things going on here. One is an order of operations that must be followed and ... | |
| differentials | 8/29/2009 |
| Q: show that if z=x^nf(u) where u=y/x then: x(dz/dx)+y(dz/dy)=nz verify this result for ... A: First verify that the z you have fits the criteria, that is, is z a function of x and y? It is so ... | |
| math | 8/28/2009 |
| Q: HO DO YOU DO THIS PROBLEM 2x+2y=14 A: Cody~ You first need to know what they asked you to do. From where I stand it 'looks' like they ... | |
| College Trig | 8/27/2009 |
| Q: Find the standard form for the equation of a circle with a diameter with ends points (-10. -6) and ... A: Jonathan~ To write the standard form of the equation of a circle you will need the radius and ... | |
| Word Problem | 8/26/2009 |
| Q: I've tried to answer this problem over and over again, but I can't seem to come that close. Here it ... A: Molly~ You have 10 sprinters, so how many of the 10 can attain 3rd place? (hopefully you say ... | |
| pre-calc (review for calculus) | 8/25/2009 |
| Q: Fractions involving 3 parts (2 I can do). Solve equation for a x + y + z = 1 - - - a ... A: Ray~ Multiply both sides by a and you will get: x +(ay/b) + (az/c) = a. Now subtract (ay/b) and ... | |
| trigonometry | 8/24/2009 |
| Q: express csc 30 degrees sin(180degrees-theta)sin(270degrees-theta)sin 3pi/2 as a single function of ... A: Kimberly~ I assume this is multiplication. The csc of 30 degrees is 1/sin 30 degrees and the sin ... | |
| College Calculus | 8/23/2009 |
| Q: Business- Markup policy. A clothing store sells a shirt costing $20 for $33 and a jacket costing ... A: Joy this is an elementary algebra problem. You are given two sets of points, with the retail price ... | |
| Circle & string | 8/21/2009 |
| Q: I work in electronics manufacturing and we have a huge inventory of electronic components. Every ... A: I can help you think through this problem. If the empty reel is 50mm and you add one winding then ... | |
| Pre-cal question | 8/19/2009 |
| Q: a boat is sailing due east parallel to the shoreline at a speed of 10 miles per hour. At a given ... A: T~ Interesting how different people see things differently. I drew a different diagram and then ... | |
| algebra help | 8/19/2009 |
| Q: can u help me solve this math problem: 3/4(13-(2+3)² A: I can help you but you need to make sure you have typed it in with the proper sets of parentheses. ... | |
| Average diameter of sphere from average profile diameter | 8/18/2009 |
| Q: If you were to randomly cut through a sphere, what would be the average diameter of the circle ... A: Matt~ You have a sample that you want to estimate the population from. Your sample is the ... | |
| Binomial | 8/17/2009 |
| Q: I)Express (2-x+8x^2)/((1-x)(1+2x)(2+x)) in partial fractions. II) Hence obtain the expansion of ... A: You did the partial fraction decomposition correctly... To use the binomial expansion expand one ... | |
| Saving $ | 8/15/2009 |
| Q: I am wanting to save money. I note that every morning I drink a coffee that costs $4 a day. $5 on ... A: Figure out how many Sat and Sun left in August and multiply that number by $5 and how many 'other' ... | |
| math | 8/13/2009 |
| Q: find center and radius 36x^2 + 9y^2 - 36x + 12y - 307 = 0 ANSWER: CJ~ You need to complete ... A: CJ~ Your a^2 is 80/9 and your b^2 is 320/9. Since 320/9 is larger than 80/9 that means the ... | |
| compound interest | 8/13/2009 |
| Q: How many years will it take to double your money if you deposit it into a fund paying 10% compounded ... A: zarak~ The amount A after t years due to a principal P invested at an annual interest rate r ... | |
| math | 8/12/2009 |
| Q: find center and radius 36x^2 + 9y^2 - 36x + 12y - 307 = 0 A: CJ~ You need to complete the square on both variables but the coefficients on the perfect ... | |
| Help find the function? | 8/11/2009 |
| Q: I'm in 8th grade currently taking Algebra. I'm confused with this problem, when I try to solve it ... A: Isabella~ Can you make sure you have typed in the problem correctly please. What you have above ... | |
| Binomial theorem | 8/8/2009 |
| Q: Can you give me a basic high school level explanation about what the Binomial theorem is and some ... A: A high school level explanation, hmmm... Well one thing that can be done is any binomial to an ... | |
| High school math | 8/7/2009 |
| Q: I am an 11th grader who is going to the 12th grade. And the math content in my country is less ... A: Typically a 10th grader takes Geometry and an 11th grader takes Algebra 2 and then the 12th grader ... | |
| college algebra | 8/7/2009 |
| Q: What is the center, foci, and asymptotes of the hyperbola x^2-y^2=18 A: Samantha~ The center is (0,0) because there is no x or y term only squared terms. [The general ... | |
| how to find three unknown variables in three simultaneous equations | 8/6/2009 |
| Q: -0.8x+0.3y+0.2z=0 0.5x-0.4y+0.3z=0 0.3x+0.1y-0.5z=0 where: x+y+z=1 how do i find the values of x, ... A: Jo Anne, there are a number of ways to find the solution to this system of equations. First I would ... | |
| Algebra, two equations | 8/3/2009 |
| Q: Sherry, This is a question from my last math competition. I have the answer key to the questions, ... A: Ankai~ There are probably many ways to approach this but this is the way I would approach the ... | |
| help me plz | 8/2/2009 |
| Q: USE dESCRATES RULE TO GIVE THE POSSIBLE COMBINATIONS OF POSITIVE,NEGATIVE,AND IMAGINARYZEROS OF THE ... A: Amy~ The first thing you need to do is understand the definition of Descartes Rule: The rule ... | |
| math | 7/31/2009 |
| Q: question-> if x/y=6/5,find the value of x^2+y^2/x^2-y^2 aneswar-> x^2+(y^2/x^2)-y^2 = (x^2/y^2 + ... A: Pratap. this is very hard for me to explain because the question is not asked correctly. I know you ... | |
| Inverse of a Matrix. | 7/30/2009 |
| Q: this is probably the longest question you have been ever asked..but please bear with me here Find ... A: no it isn't right unless there is no solution because you have arrived at 0*x + 0*y = -2 and there ... | |
| Math problem | 7/29/2009 |
| Q: I need help finding the factors and x intercepts of this equation: x3-1320x2+398351x I am tutoring ... A: there is one very visible factor: x since x(x^2-1320x+39835)is equivalent to what you began with. So ... | |
| ap calculus | 7/28/2009 |
| Q: what is the range for the following greatest integer function: f(x)=[x] ANSWER: Bob~ All that ... A: Bob, I need to explain some more because you obviously do not understand the greatest integer ... | |
| ap calculus | 7/28/2009 |
| Q: what is the range for the following greatest integer function: f(x)=[x] A: Bob~ All that is meant by range is if you were to graph the function, what values could y have? ... | |
| On Complex numbers | 7/26/2009 |
| Q: the complex number w is given by w=-1/2 + i(3^1/2)/2. Find the modulus & argument of w. Thank you A: The modulus really is the hypotenuse of a right triangle of the complex number graphed on the x-y ... | |
| Domain of a function | 7/26/2009 |
| Q: I'm confused how to do this with a sqrt. Can you walk me thru this please? f(x) = radical 4 ... A: Susan~ Any even root has to have the value under the radical greater than or equal to 0, i.e., ... | |
| a calculus ab | 7/23/2009 |
| Q: solve for x: e^(2x) - 2e^(x+2) + 4e = 0 (hint: factor) ANSWER: Sabrina u substitution works nicely ... A: This makes the problem even easier yet since it is not necessary to use the quadratic formula or to ... | |
| a calculus ab | 7/23/2009 |
| Q: solve for x: e^(2x) - 2e^(x+2) + 4e = 0 (hint: factor) A: Sabrina u substitution works nicely for this one. Let u = e^x so your equation becomes u^2-(2e^2)u ... | |
| abstract rate | 7/21/2009 |
| Q: A nurse knew that g gallons of milk would feed s infants for 12 days, but she had s+15 infants. How ... A: One way to view this problem is to set up a proportion. Let's look at the number of gallons of milk ... | |
| Math (Algebra 2) Help | 7/20/2009 |
| Q: Wallin, Can you please help me with this problems? 1) 7x^2/9y divided by [4x]/[15y^2] times ... A: You are trying to take a fraction that is written vertically and type it horizontally which will ... | |
| Math (Algebra 2) Help | 7/20/2009 |
| Q: Wallin, Can you please help me with this problems? 1) 7x^2/9y divided by [4x]/[15y^2] times ... A: Margaret~ First I need you to clearly state the problems. 1) the way it is written is saying ... | |
| Trigonometry | 7/19/2009 |
| Q: Verify that cot(x+y) cot(x-y)=1-tan^2x tan^2y/tan^2x-tan^2y is an identity. A: Kenny~ cot(x+y)*cot(x-y) = [1/(tan(x+y)]*[1/(tan(x-y))] = 1/[(tanx + tany)/(1-tanxtany)]* ... | |
| Logarithms | 7/19/2009 |
| Q: sherry wallin, i worked out this problem can u please check ? Write the following into single ... A: Sure can Raja~ I will number them 1-3 and explain how I went from 1-2 and 2-3: 1) = ... | |
| Logarithms | 7/17/2009 |
| Q: sherry wallin, i worked out this problem can u please check ? Write the following into single ... A: One way to know if your answer is equivalent to the original is to substitute values into the ... | |
| trigonometry | 7/16/2009 |
| Q: prove the trigonometric identities: 1- cot^2/1+cot^2 = sin^2-cos^2 A: First you want to ALWAYS use an argument with your trig functions, else they are not defined. So ... | |
| Calculus: Techniques of Integration | 7/15/2009 |
| Q: Use trignometric identities to simply the function and then integrate with respect to x i. sin^4 x ... A: It isn't necessary to use a trigonometric identity to integrate this problem. You can use a formula ... | |
| Math theory/formula for averages | 7/13/2009 |
| Q: I am trying to discover if there is a math formula that already addresses my problem. Perhaps you ... A: Mark~ That won't work because the probabilities need to add up to 1. If you use .5x + 50 you ... | |
| volume of washer in sq. in. | 7/11/2009 |
| Q: Item is 1.895 O.D. x 1.625 I.D. x .437 thk. What is volume? Answer needs to be in square inches. A: Alan, the answer will NEVER be in square units, you are talking VOLUME which is ALWAYS cubic units. ... | |
| Math help | 7/9/2009 |
| Q: we have a team of 12, I am in NZ, we work 5 x working days. it is now 10th of July and the team ... A: Ok it is the same math. There are 15 days to obtain 560 - 172 = 388 stars with 12 men that means ... | |
| Math help | 7/9/2009 |
| Q: we have a team of 12, I am in NZ, we work 5 x working days. it is now 10th of July and the team ... A: You have 15 working days left in the month of July (not including the 10th). I am assuming the team ... | |
| permutation and combination | 7/8/2009 |
| Q: 1)A number cube(die) is rolled and a coin is tossed.Find the number of outcomes in which an even ... A: Shruti~ #1 the sample space is:1,H;1,T;2,H;2,T;3,H;3,T;4,H;4,T;5,H;5,T;6,H;6,T so there are 12 ... | |
| Kinematics | 7/7/2009 |
| Q: A train travels from A to B,a distance of 20000m,taking 1000s.The journey has 3 stages.In the first ... A: Here is my reasoning, see if this makes sense to you: The distance traveled in the first leg of the ... | |
| Similarity Problem | 7/6/2009 |
| Q: I've got a maths problem: Let ABC be a triangle. Two straight lines which are parallel to the side ... A: Your question is not clear to me. What do you mean by 'what parts is the side AB divided by the ... | |
| permutation and combination | 7/5/2009 |
| Q: In a class comprising boys and girls, there were 45 handshakes amongst the girls and 105 handshakes ... A: I am going to use nCr to mean n things taken r at a time. If there were 45 handshakes among the ... | |
| permutation and combination | 7/5/2009 |
| Q: 1)A hollow glass cylinder is filled with 10 different colored balls.If radius of the balls are ... A: Shruti~ I will do #2 for you: There are 5 different jobs and select any one job and assume that ... | |
| Trignometry | 7/4/2009 |
| Q: How to show dy/dx=((sin2x)/(1-cos2x)) =cotx? Try already using cos2x & sin2x formulae but still ... A: Warm~ I think the question is written incorrectly because ((sin2x)/(1-cos2x)) = cotx. You ... | |
| equation | 7/3/2009 |
| Q: 1) Kim bought a total of $2.65 worth of postage stamps in four denominations.If she bought an equal ... A: Let x be the number of 5 cent (.05x) and 25 cent stamps (.25x). Since Kim bought twice as many 10 ... | |
| math | 7/3/2009 |
| Q: at work we have this reward system if the team achieves 560 stars as a whole they will get a team ... A: Tim~ One way to answer this question is to determine the number of work days in July. Looking ... | |
| I really need help please help . | 7/2/2009 |
| Q: Translate the following problems into algebraic equations. Do NOT solve the equations; simply ... A: For #1 think of the problem as: let x = the thing you are being asked about 'what number' and 'is' ... | |
| Trig | 7/1/2009 |
| Q: Hey I need some help on some questions and they are due tommorrow! How do you prove: (cosx + ... A: (cosx + cosy)^2 + (sinx + siny)^2 = 4cos^2(x-y/4) Start with one side and try to come up with the ... | |
| calculus | 6/30/2009 |
| Q: Given ΔABC, find the area of the triangle to the nearest tenth of a unit. 1. a = 6 cm , b = ... A: I see this as algebra or trigonometry and this is how I would approach finding the areas of these ... | |
| Hello | 6/29/2009 |
| Q: I need help with these. Can you please help? 1) Convert (10011110)^2 to a hexadecimal number 2) ... A: This is computer programming code but I can help you with this one. When you declare a variable in a ... | |
| Cubic inch container dimension | 6/29/2009 |
| Q: Ive been trying to solve the following question. A cylinder is 11 inches long and contains 72 cubic ... A: Mr. T~ You need to know the formula for the volume of a right circular cylinder which is ... | |
| Volume calculation | 6/26/2009 |
| Q: Wallin I want to make a mixing drum with a volumetric capacity of 9 cu.ft. I found that the formula ... A: yes of course I will explain how to change cubic feet into cubic inches. There is 12 x 12 x 12 cubic ... | |
| math | 6/21/2009 |
| Q: the sum of three consecutive numbers is 105,find the numbers A: As with all word problems there is an unknown so there must be a variable. Let n = the first number ... | |
| Hello | 6/18/2009 |
| Q: I need help with these. Can you please help? 1) Convert (10011110)^2 to a hexadecimal number 2) ... A: Andy I sent an explanation but it went to internet heaven. I will write one and attach it with a ... | |
| Calculas | 6/17/2009 |
| Q: Find the equations for all the lines tangent to the graph of y = x3 – x that passes through the ... A: Attir~ I'm not sure what it is is you are trying to ask? I gave you the equations of the lines ... | |
| Calculas | 6/16/2009 |
| Q: Find the equations for all the lines tangent to the graph of y = x3 – x that passes through the ... A: Attir, need some help with calculus! To find the tangent line you need to take the first derivative ... | |
| Calculs | 6/16/2009 |
| Q: Find A, B, C, D such that the graph of f(x)= Ax^3 + Bx^2 + Cx + D is tangent to the line y = 3x -3 ... A: Attir~ This is not an easy problem since solving the system gets messy algebraically but the ... | |
| Follow-up Question: Exponents | 6/15/2009 |
| Q: I want to thank you for your reply. I need to send this follow-up question to the one below ... A: I didn't put in those number(#) symbols in my calculation above FYI. Hmmm...as I said above the ... | |
| Exponents | 6/14/2009 |
| Q: How is the following solution found for the following: (100^365/73)/5 or if typed as follows in ... A: The # sign represents the number of days in the year because there are not 365 days in each year ... | |
| Exponents | 6/13/2009 |
| Q: How is the following solution found for the following: (100^365/73)/5 or if typed as follows in ... A: Kenneth~ There are a couple of ways to interpret a fractional exponent. The denominator is the ... | |
| Exponents | 6/13/2009 |
| Q: How is the following solution found for the following: (100^365/73)/5 or if typed as follows in ... A: The two are NOT equivalent...what is equivalent to the first is: (100^365/(73*5)). Taking 100 to the ... | |
| rule of function | 6/11/2009 |
| Q: I was on the right track but made a silly error. I tried your method to another problem, I tried ... A: Ok Sabrina~ This is just one of probably many ways to figure this problem out but its the way ... | |
| finding a rule from a table | 6/11/2009 |
| Q: I'm in the 6th grade and I cannot find the rule from the follwing table. x=5, -5, 0, -1 y=25, 25, ... A: Look at the x values and the y values and see if you can find a pattern. I am going to write the ... | |
| Algebra 2 help | 6/10/2009 |
| Q: I am having difficulties with some math problems and was wondering if you could help me. I would ... A: 1) -99<0 so the parabola opens down and has maximum 2) 4x^2-4x^2 = 4 is never true, i.e., 0 = 4 is ... | |
| Algebra 2 help | 6/10/2009 |
| Q: I am having difficulties with some math problems and was wondering if you could help me. I would ... A: I'm not sure what your goal is. Were you looking for answers or ways to learn how to do these ... | |
| math | 6/10/2009 |
| Q: The amount of wire on a spool is listed as 150m. How many pieces of wire 10ft long can you cut from ... A: well sure it requires two calculations. One is to convert from meters to ft and then find out how ... | |
| math | 6/9/2009 |
| Q: If an object travels 400m in 253s, what is its speed in m/s? A.12.2m/s B.13.1m/s C.1.58m/s D.20m/s A: Anthony~ This is quite simply a problem where you need to know d = rt forwards and backwards. ... | |
| Calculus | 6/6/2009 |
| Q: i am having finding the following questions really difficult and was wondering if you could please ... A: When you are told to find dy/dx that is just saying find the derivative of y with respect to x. It ... | |
| HELP! | 6/6/2009 |
| Q: given that y = (cos^3x)/3 what is dy/dx? A: Kristin~ dy/dx is the first derivative of y with respect to x. The derivative of the cos x is ... | |
| HELP! | 6/5/2009 |
| Q: 1. F(X) = 4SINX. THE MINIMUM VALUE OF F(X) is 2. if y=cosx/(1-sinx), then dy/dx = k/(1-sinx) A: Kristin~ Take the first derivative of F(x) and set it equal to 0 to find the max or min value. ... | |
| Pre Calculus | 6/4/2009 |
| Q: I Need help establishing an identity: Sec-Cos/Sec+Cos = Sin^2/1+cos^2 A: First we need to correct the notation. The trig functions are functions and that means they need to ... | |
| pre-calculus | 6/3/2009 |
| Q: Find and simplify the difference of f f(x-h)-f(x)/h, h does not equal to zero. given f(x)= 1/8x. ... A: Ok. If that is what you meant then what you need to do is use parenthesis like this 1/(8x) otherwise ... | |
| HELP! | 6/3/2009 |
| Q: if y = cosx-sinx then d^2y/dx is? Please help me it would mean alot!!! ANSWER: Hi Kristin Munroe~ ... A: Kristin~ You want to evaluate the integral from x = 0 to x = sqrt 2 on ... | |
| pre-calculus | 6/3/2009 |
| Q: Find and simplify the difference of f f(x-h)-f(x)/h, h does not equal to zero. given f(x)= 1/8x. ... A: For f(x-h) everywhere there is an x you will put in x-h. that is what you meant by 1/8 x, you meant ... | |
| calculus sum | 6/1/2009 |
| Q: Hey, I have another question for you if you get a chance. Approximate the sum of the series ... A: Janine~ You can look at the series as being the sum of [(-3/2)^n]/n! Note that n! grows faster ... | |
| algebra 2 | 5/31/2009 |
| Q: how do you evaluate log(3)243 ANSWER: Hi Devin~ You are really looking for what power to raise ... A: Please feel free to ask new questions but don't do them as follow up questions because this question ... | |
| Differentiation: Maxima and Minima | 5/31/2009 |
| Q: In a mathematical model of the growth of a sunflower head, it is assumed that a time, t, seed ... A: I think the problem is written incorrectly. I think the answer needs to be 2t -q-2(t^2-qt)^(1/2) ... | |
| math | 5/30/2009 |
| Q: There are 220 barrels of cement in one shed and 510 barrels in another shed. How many barrels must ... A: B because you are removing x barrels from 510 in the 2nd shed and then that means you will have 220 ... | |
| Continuity with integrals | 5/29/2009 |
| Q: Let F(x) = intergral (o,x) f(t) dt where f(x)= absolute value of (1-x) if absolute value of x is < ... A: F(x) is not differentiable at x = +-2 thus cannot be continuous at either point. Check the limits as ... | |
| math | 5/29/2009 |
| Q: A,B,and C can finish a job in 6 days. If B and C work together, the job will take 9 days;if A and C ... A: Anthony, you really had to make me think about this one... :) Since A,B,and C can finish a job in 6 ... | |
| Alg. 2 | 5/28/2009 |
| Q: 1. What is the length of the major axis of 7(x + 2)^2 + 2(y - 2)^2 = 49? 2. What is the center ... A: In order to do these problems you need to know what kind of equations each is. #1,2 are circles. The ... | |
| math | 5/27/2009 |
| Q: Ann's age is seven-tenths of Bill's age. In 4 years Ann's age will be eight-elevenths of Bill's age. ... A: Good morning Anthony~ This is the kind of problem that lends well to putting the info into a ... | |
| percentage | 5/27/2009 |
| Q: Of the votes cast on certain proposal, 80 more were in favour of the proposal than were against it. ... A: You need to determine the relationship between the quantities so you need to define some variables. ... | |
| math | 5/26/2009 |
| Q: The difference between two numbers is 15. When twice the smaller number is subtracted from three ... A: I don't know if you have to solve this with one variable or two. I am going to assume you can only ... | |
| equation | 5/22/2009 |
| Q: MyDetermine all monotonic functions f defiend on te set of realnumbrs, such that f(x)+2x=f(f(x)). I ... A: Hmmm...let f(x) = ax so that ax + 2x = f(ax) = a^2x. Now set all that equal to 0. a^2x - ax - 2x = 0 ... | |
| math | 5/21/2009 |
| Q: (a^2+2)/b / (a + (2/a))= A: (a^2+2)/b / (a + (2/a))= (a^2+2)/b /([(a^2)+ 2]/a])= a/b rewrite (a^2+2)/b /([(a^2)+ 2]/a]) as ... | |
| math | 5/20/2009 |
| Q: COuld you please check my answers: 3.) Describe the following graphs: The graph of -7 < 4x − ... A: Lisa~ 3 - The graph of -7 < 4x − 3 ≤ 7 has: open circle on -1 and a closed circle on ... | |
| math | 5/20/2009 |
| Q: could you check my answers please, whatever is wrong can you tell me why and give me the right ... A: 1- domain is {-1, 0, 2, 3}; range is {0,3,4}; is not a function 4 - domain is {-2, 2, -1, 0, 1}; ... | |
| arithmetic | 5/18/2009 |
| Q: If two digit integer M and N are positive and have same digits, but inreverse order, which of the ... A: I hope you aren't looking for an analytical answer to this problem because I can tell you the answer ... | |
| math | 5/17/2009 |
| Q: Find the fraction equivalent to the fraction: ab/cx A: There are a gazillion fractions equivalent to the given fraction. Was there any other instructions ... | |
| math | 5/17/2009 |
| Q: Find the lowest common multiple of 2x^4-2x^2y^2,4x^5+8x^4y+4x^3y^2,and 6x^2+6xy. A: Let's first look at how to find the (lcm) least common multiple of a set of numbers in a way that ... | |
| applications of matrices | 5/15/2009 |
| Q: i was ordered to submit report on applications of matrices. can u please instruct me some websites ... A: Sirisha~ I need to know what level of math you are doing. There are many applications. You can ... | |
| math | 5/14/2009 |
| Q: 3xSquared y(3xSquared y-6xySquared)= ANSWER: Hi Anthony~ I think what you want to find is ... A: Sorry Anthony I misread what you originally wrote even though I typed it the way you wrote it. Ok so ... | |
| About Geometric Progression | 5/13/2009 |
| Q: Sir, I just read a solution of the following question. What is the sum of 1st n odd integers..? And ... A: Aniket~ Thank you for your patience. It still is not clear what you mean by 'solve it'? To ... | |
| math | 5/13/2009 |
| Q: 3xSquared y(3xSquared y-6xySquared)= A: I think what you want to find is 3x^2y(3x^2y-6xy^2). Is this correct? There is nothing wrong ... | |
| algebra | 5/13/2009 |
| Q: the tens' digit of a two-digit number is 3 more than the units digit. the number is 8 more than six ... A: A funny thing about our base 10 number system any number can be written times a power of 10 so for ... | |
| Math | 5/12/2009 |
| Q: 1.) Use this equation for # 1 - 4. -5x^2 - 45x + 20 = 0 What is the value of a? answer: -5 2. ... A: Lisa~ Are you wanting the correct answers, the method or just to know if you are right or wrong? ... | |
| alg 3 | 5/12/2009 |
| Q: this is my last time I will b doin this but I will need you in the summer but thanx for the past ... A: You need to graph each inequality with it's corresponding equation. Then choose a point and if it ... | |
| alg 3 | 5/11/2009 |
| Q: but I need help with these im really lost Find the distance between the following coordinates 1. ... A: The formula for the distance between two points is: d(P1,P2)= sqrt[(x2-x1)^2 +(y2-y1)^2] I will do ... | |
| About Geometric Progression | 5/11/2009 |
| Q: Sir, I just read a solution of the following question. What is the sum of 1st n odd integers..? And ... A: I think there is still a problem with what you gave me. In your difference table your third entry is ... | |
| About Geometric Progression | 5/10/2009 |
| Q: Sir, I just read a solution of the following question. What is the sum of 1st n odd integers..? And ... A: Something is wrong with the data you were given. The first three odd integers is 1+3+5 = 9 not 10 ... | |
| trigonometric graphs | 5/9/2009 |
| Q: I have to wirte an essay for pre-cal and i need some help. How are trigonometric graphs used in the ... A: The two most common trigonometric graphs that are used are the sine function and the cosine function ... | |
| cubic quadratic | 5/6/2009 |
| Q: x^3+5x^2+2x=0 A: Please post the question you need answered. I am going to assume you want to solve this equation. ... | |
| calculus | 5/5/2009 |
| Q: 5.)Find the dimensions of the rectangle with the largest area inscribed inside the area bounded by y ... A: The area of a rectangle is 2xy. Eliminate y from 2xy by substituting y = 16-x^2 into 2xy. So 2xy = ... | |
| alg 3 | 4/29/2009 |
| Q: Perform the indicated operation 1. 1/5y-1 times 125y^3 - 1/y-1 2. a^2 - 81/a+9 divide (a-9)^2 /9-a ... A: You are cheating your child if you are not allowing him/her to learn this the right way. 15) Let x ... | |
| quadriatic word problem | 4/28/2009 |
| Q: One rocket has an initial velocity of 48 feet per second. The other has an initial velocity of 64 ... A: The equation you sent me is the standard quadratic equation for describing what an object on earth ... | |
| alg 3 | 4/27/2009 |
| Q: 1. 4x + 3y = 12 2 2. y = ----x - 5 3 y + x = 3 3. 2x - 3y > -2 4. y < 3x - 1 ... A: Any equation which is solved for y such as 2,4, and 5 you can choose any value for x and then solve ... | |
| RATIONAL EQUATION HELP | 4/23/2009 |
| Q: PLEASE SHOW HOW TO SOLVE THE FOLLOWING RATIONAL EQUATION: (6x)/(x+4)+(4)=(2x+2)/(x-1) A: The first thing you need to pay attention to is the domain of the rational expressions. On the left ... | |
| Finding the peak of a curve | 4/22/2009 |
| Q: I am trying to produce a spreadsheet that will calculate to peak of a parabolic curve (convex up) ... A: Yes there is a way to use 4 points to generate the equation of a parabola, although it is not ... | |
| subsets | 4/21/2009 |
| Q: 1. A 10-element set has ___ subsets. 2. Also, set A has 15 proper subsets. How many elements are ... A: Angie~ 2^10 subsets is the answer to 1. It is always 2^(# of elements in A) for the number of ... | |
| Proving Trig identities | 4/20/2009 |
| Q: "all x's stand for theta (1+sinx)(1-sinx)(secx+1)(secx+1) [sinx-(sinx)(cosx)]/1-cosx ... A: Kate~ The problem is, there is no problem. If you were to say for example that you need to show ... | |
| problem | 4/18/2009 |
| Q: 2. how many positive integers less than 1 000 000 have the sum of their digits equal to 19? 3. Let ... A: Carl~ A couple of quick thoughts about #2. How many ways can you get a sum of 19 with 3 digits? ... | |
| prove or disprove/rational, irrational sums | 4/18/2009 |
| Q: I have a question that I am hoping you can help me with. My professor assigned me with a special ... A: You need to say that m/n and p/q are such that gcd(m,n) = 1 and gcd(p,q) = 1. This is so that you ... | |
| Math | 4/17/2009 |
| Q: Pete Rossini has just graduated from college with honors. He has been offered four jobs with the ... A: Belinda~ What is the question you have? To calculate the amount for the first year by the week ... | |
| logic... prerequisit to abstract algebra | 4/16/2009 |
| Q: help me for this some hard question about logic 1. A triangle has at least three sides. 2. A ... A: I think they are wanting you to assign truth values to these statements and then decide it they are ... | |
| alg 3 | 4/15/2009 |
| Q: For the hyperbola 4y^2 - 9x^2 = 36 1. Which way does it open? 2. What are the coordinates of the ... A: 17 - [(4*sqrt2)^2]/16- (3^2)/9 = [16*2]/16 -9/9 = 32/16 - 1 = 2-1 = 1 thus 4 sqr root( 2, 3) is a ... | |
| algebra 3 | 4/14/2009 |
| Q: Determine how the following parabolas open. Answer A if it opens to the right, B if it opens to the ... A: Any parabola with y = to something will open up if x is positive and down if x is negative. Likewise ... | |
| limit definition of a derivative | 4/12/2009 |
| Q: I am trying to prove that (sin^2(x))' = 2sinxcosx. I substituted sin^2(x) into the formula ... A: The derivative of sin 2x is 2 cos 2x. The sin 2x is 2sinx cosx. In other words the sin of twice the ... | |
| Math Formulas | 4/12/2009 |
| Q: My wife and I were watching a movie where a character was playing the role of a Mathematician. He ... A: A formula consists of variables and the variables represent some quantity that may or may not be ... | |
| Angle of elevation | 4/10/2009 |
| Q: HOw do you find the angle of elevation only given two of the triangles side lengths but nothing ... A: It is unclear to me what you mean by 'only given two of the triangles side lengths'. Does this mean ... | |
| graph name | 4/9/2009 |
| Q: I'm looking for the name of the graph formed by x cubed plus x squared. Does this shape have a ... A: I'm not sure about a name and I'm not sure what level of math you have had. You can use calculus to ... | |
| Determinants | 4/7/2009 |
| Q: I'm a 25 year old computer science student. I'm not sure if linear algebra is considered abstract or ... A: Some thoughts: If you take any nxn matrix you can find it's determinant by using cofactors that are ... | |
| verifying trig identitys | 4/6/2009 |
| Q: tan+(cos/1+sin)=sec plz solve this for me and send me the answer back asap A: Sean~ I will help you but you need to practice finding these relationships because it is ... | |
| Business Calculus | 4/6/2009 |
| Q: I need to know how to find the curve sketching of f(x)=x^4-2x^3+x^2 f(x)=x+1/x+2 f(x)=x-1/x^2 A: Might I assume you have to sketch by hand? There are a few standard graph techniques that I will ... | |
| Standard deviation | 4/5/2009 |
| Q: Estimate the proportion of commuters whose travelling times are within 1 standard deviation of the ... A: Warm~ There are a number of ways to determine the standard deviation. You could calculate it by ... | |
| Statistic-data representation | 4/5/2009 |
| Q: Grouping the data with classes 10-19,20-29,...,60-69,determine the frequencies for these classes & ... A: Warm~ In this case I believe they are hinting for you to use a histogram which is just a ... | |
| inequality | 4/3/2009 |
| Q: Answear: Hi Grull~ Try this: since 0<a<1 and 0<b<1 we know that ab<1 and ab^(2/3)<ab<a likewise ... A: Sorry it has taken me a bit to get back to you. Let x^(2/3) be x*. Then try to assume that a is the ... | |
| abundant numbers | 4/1/2009 |
| Q: Is zero an abundant number? A: Math Curious ? By definition "a positive number N is abundant if..." 0 is neither negative or ... | |
| removal exam for summer exam | 3/31/2009 |
| Q: plss...answer this some question... if i dont answer this i just kick on my school for the first ... A: Here I will choose one to answer and explain for you: 3) The only singleton answer is when k = 0 ... | |
| inequality | 3/29/2009 |
| Q: I've the following problem: x, y are positive numbers and x+y=1. How can i proof, this inequality ... A: I'm hoping you are in at least calculus. Take the derivative of f(x) = x(1-x)^(2/3): ... | |
| confusion | 3/29/2009 |
| Q: 1- If I do postgraduates in mathematics , will I expose to " matlab " software on my studies of ... A: AOB~ I would say it is highly likely that doing master level mathematics will expose you to ... | |
| Surjective mapping - not | 3/24/2009 |
| Q: Let S be an arbitrary non-empty set and let P(S) denote its power set. Prove by contradiction that ... A: Steve~ Yes, assume there is a surjective mapping f from S --> P(S). By definition then every ... | |
| Equivalence Relation question | 3/24/2009 |
| Q: What equivalence relation gives this partition P of the natural numbers? P ... A: Steve~ How about aRb iff a = b^n for n a natural number? Yes your assumption is correct that ... | |
| parabola | 3/23/2009 |
| Q: Brand X wrist watches sells at a department store sell for $50 at a rate of 45 per month. The ... A: There are a number of ways to graph the function but start by locating the vertex and then find the ... | |
| what steps do you need to do? | 3/22/2009 |
| Q: if cos A=1/3, find cos 4A How would you solve this? A: There are probably several ways to conquer this question but here is just one way to do it: First ... | |
| Algebra Question | 3/22/2009 |
| Q: I have a question on equivalence relations that I do not know how to start answering....can you help ... A: Steve~ To be an equivalence relation on a set S you must show that the relation is reflexive, ... | |
| Algebra Question | 3/21/2009 |
| Q: For any sets A, B, C, D prove (A x B) U (C X D)= (A U C) x (B U D). I am not too sure where to ... A: you are right in your assumption. The next thing for you to decide is what an element in (A x B) U ... | |
| solutions | 3/20/2009 |
| Q: For what value(s) of a does the system of equations (i) x^2 = y^2 (ii) (x - a)^2 + y^2 = 1 i cant ... A: Nickson~ Try plotting several points for x^2 = y^2. Let's see when x = 0, y = 0. When x = 1 ... | |
| parabola | 3/20/2009 |
| Q: Brand X wrist watches sells at a department store sell for $50 at a rate of 45 per month. The ... A: You are given the factorization of the quadratic equation that models this problem. Geometrically ... | |
| math | 3/19/2009 |
| Q: two bicycle riders covers a certain distance at the rate of 15km/hr and 16km/hr,one rider takes 16 ... A: The first rider is traveling slower and it takes him 16 minutes longer to travel the same distance ... | |
| Fundamentals of Modern Math makes me cry.. | 3/19/2009 |
| Q: I have to write an application problem using a Venn diagram with three different sets and describe ... A: It is not clear to me what your first question is. Are you asking me to describe A intersect B ... | |
| Assignment | 3/18/2009 |
| Q: can you help me with my assignment... pls help me this is my assignment i only answer question ... A: Charise~ Hi I only have time to answer a couple of these before I go to work. 3) since the ... | |
| math | 3/18/2009 |
| Q: two bicycle riders covers a certain distance at the rate of 15km/hr and 16km/hr,one rider takes 16 ... A: These problems use the relationship d = rt. Say rider 1 is going 15kmh and rider 2 is going 16kmh. ... | |
| MATHS | 3/17/2009 |
| Q: Can you please calculate the dot product of each of the following pairs of vectors, and also state ... A: John~ The dot product is just a number and you can only multiple 'like terms', this means i's with ... | |
| problem | 3/16/2009 |
| Q: find the exact value of tan pi/12 I do not know how to solve this problem so can you please solve ... A: Exact value means not a decimal approximation. The tan of any angle is the[sin of the angle]/[cos ... | |
| Matrices | 3/16/2009 |
| Q: y-5x=0 3x-5y=2 is it concident or parallel or intersecting? A: Ashley~ What is it you want to know? Are you wanting to know what coincident means, parallel, ... | |
| Mills & Decimals | 3/15/2009 |
| Q: I read the following in an old business mathematics textbook: "Express 13 mills as a decimal part ... A: Technically you could speak about decimal parts like that but it loses it's purpose. Percents mean x ... | |
| pipe problems | 3/15/2009 |
| Q: A pipe can fill up the tank with the drain pipe open in 3 hours. If the pipe runs with the drain ... A: Lawrence~ Hi. I hope you like fractions because these problems are best done with ratios. If a ... | |
| Mills & Decimals | 3/14/2009 |
| Q: I read the following in an old business mathematics textbook: "Express 13 mills as a decimal part ... A: Anything positive and smaller than $1.00 can be thought of as a decimal part of $1.00. Decimal part ... | |
| Algebra question | 3/13/2009 |
| Q: The circumference of a circular plot of land is increased by 10%. What is the best estimate of the ... A: keane~ I am guessing you would like to know why that is the answer or perhaps you just want it ... | |
| Mills & Decimals | 3/13/2009 |
| Q: I read the following in an old business mathematics textbook: "Express 13 mills as a decimal part ... A: Kenneth~ "as a decimal part of $1.00" means the mills divided by $1.00. Remember every dollar ... | |
| arithmetic | 3/11/2009 |
| Q: how can i find the lcm of 3 20 and 15 i have been stuck on this for about 20 min now A: lindzye~ There are lots of methods but probably the easiset is to multiply each by 1, then 2, ... | |
| matrices | 3/10/2009 |
| Q: what is a linear matrices and how to calculate it A: ELMASTA MANICUS~ A linear matrix is an array of numbers that represents linear equations. Do ... | |
| Need help with this Algebra problem... | 3/9/2009 |
| Q: I need help with this Algebra problem...I think the answer is 2, The weight is divided by 2, but I ... A: Bee~ "y varies inversely as x or y is inversely proportional to x" can be translated into y = ... | |
| Demand functions | 3/9/2009 |
| Q: Given a demand function of the form 0.1Q-10+0.2P+0.02P2=0 calculate price elasticity of demand when ... A: I think this an economic or business question, probably better served in those areas but let me give ... | |
| math | 3/7/2009 |
| Q: A 110 meter long train is moving at a rate of 60Km/hr.in what timeit will cross the man who is ... A: This is a distance = rate*time problem. Build a table with each represented: rate time ... | |
| math | 3/5/2009 |
| Q: 3x^-2y^5z^3 A: Briana~ You should use parentheses when typing in math and it is unclear. Also you should state ... | |
| algerbra | 3/4/2009 |
| Q: i am in a jam here. i am just now learning about functions and the input and output but one problem ... A: Are you suppose to write the function that relates the input to the output? By listing 2 rows of ... | |
| math | 3/3/2009 |
| Q: A father had three sons.they were born at the interval of 3 years .the total age of of three sons is ... A: Pratap~ Sorry it took me a bit to answer, I have been very busy and this got lost in my emails. ... | |
| math | 3/2/2009 |
| Q: if a train cross a pole in 10 second and cross a 150 mtr length Platform in 20 second.then findout ... A: The length of the train can be found using ratios. Compare the length of the train to the length of ... | |
| valume and weight problem | 3/1/2009 |
| Q: Here is myImagine two spheres of metal, one nested concentrically inside the other. The outer sphere ... A: You really only have a problem where you calculate the volume of the outer sphere and then calculate ... | |
| math | 2/28/2009 |
| Q: a man start walking straight towards east.After walking 75meter ,he turns to the left and walks 25 ... A: The best way to solve this problem is to see it in a picture. The answer is 35m but it is easier to ... | |
| Word Problems and Triangles | 2/27/2009 |
| Q: 1. Many of the amenities at a local ski hill are run using gas generators. To transport gasoline to ... A: Hmmm...which one would you like to see worked and explained? The purpose of this site is to help you ... | |
| graph lines, standard form | 2/25/2009 |
| Q: what is the line graph for 2x-y=6? A: There's a number of ways to answer this question. I am going to assume you are new to this idea ... | |
| Completing the square | 2/23/2009 |
| Q: 2x-7x-15=0 how to solve step by step A: There are several methods to completing the square but since you are asking I am going to assume ... | |
| Work | 2/19/2009 |
| Q: Find the average value of f(x) = cos²x on the interval [0, pi/2] ANSWER: Hi Tyson~ One ... A: This sounds like a Physics problem. Work can be defined as the dot product of the force and the ... | |
| Average Value of a function | 2/19/2009 |
| Q: Find the average value of f(x) = cos²x on the interval [0, pi/2] A: One definition of the average value of a function is: 1/(b-a)int(b to a)f(x) dx, so this translates ... | |
| math | 2/18/2009 |
| Q: If 13 = 13w/(1-w) ,then (2w)2 = A.1/4 B.1/2 C.1 D.2 Ans.C please explain the avobe problemm A: I wish I could explain the above problem except I don't happen to agree with the answer you gave. In ... | |
| math | 2/18/2009 |
| Q: If the operation,^ is defined by the equation x ^ y = 2x + y,what is the value of a in 2 ^ a = a ^ 3 ... A: I like to think of the relationship x ^ y = 2x + y as being 2 times the first plus the 2nd. So in ... | |
| proove that for sets A, B, C, and D the following is true | 2/16/2009 |
| Q: (A x B)intersect(B x C) = (A intersect C)x(B intersect D) i don't know where to start, all i know ... A: Hey Dave~ I think you have written the problem wrong. Correct me if I am wrong but I think you ... | |
| summation | 2/15/2009 |
| Q: Evaluate: Σ[log k] over all k where k is a factor of 1 000 000 000 000 except 1 and 1 000 ... A: Hey Lawrence~ I will make a few comments that might be helpful: The greatest integer function ... | |
| Percentages | 2/13/2009 |
| Q: To change a number to a percent, move the decimal two places to the right and add a percent sign. ... A: The rules for percentages remain the same no matter what unit of measure is attached to the number. ... | |
| engineering mathematics | 2/13/2009 |
| Q: (i) Fine dy/dx,if f(x)=xlnx (ii) If x= n/rln(1/r),find the value of r for which x will be maximum A: For i) just use the product rule for derivatives. When asked to find dy/dx it is the same thing as ... | |
| Slopes | 2/8/2009 |
| Q: Given the slope of the line, find the equation for each line. a) A line of slope 4 passing through ... A: You must be in a basic elementary algebra course. There are a few well known formulas that can help ... | |
| Finding the sum in each part. | 2/7/2009 |
| Q: I'm in a college math class called Fundamentals of Modern Math- whatever that's suppose to mean, ... A: Study the pattern given. The first is 4 or 4/1 or even 4/(3^0). the second number is 4/(3^1). The ... | |
| Investment | 2/7/2009 |
| Q: $5,000 is contributed each year for 40 years and makes an annual return of 8% on the investment. ... A: Are you asking me to give you a formula to find this or how do you figure out the formula to answer ... | |
| Algebra | 2/6/2009 |
| Q: What are the Real Zeros in these functions: 9x^2-6x-4 16x^2-31+13 x^2-18x+74 A: What level of Algebra are you in? It would be helpful to know so that I can address this ... | |
| mathematics | 2/5/2009 |
| Q: what is the formula to find the orthocentre of a triangle when 3 of its vertices are given A: I'm not aware of any direct 'formula' for finding the orthocenter of a triangle given only the ... | |
| Identities | 2/4/2009 |
| Q: how do i express i = 100sin(θ) + 150sin(θ + Π/3) as Rsin(θ ± α) and ... A: There is a set of parenthesis around (sin(x)*1/2 + cos(x)*sqrt(3)/2) so distribute the 150 150 ... | |
| math | 2/3/2009 |
| Q: Equality of complex number > two complex numbers z_1=a+ib and z_2=c+id are said > to be equal ... A: Pratap~ I will help you answer this. It is unclear what the numbers in a,b,c, and d ... | |
| 3 unknowns?? | 1/31/2009 |
| Q: I have a question which i don't really know how to categorise, I just know that it's hard for me. ... A: how's your day going? Mine is fine. Remember a point is just an ordered pair (x,y), the first ... | |
| statement problem - mba | 1/30/2009 |
| Q: can u please help solve this problem showing in detail the calculation Kleen Karpet cleaned 65 rugs ... A: This sounds like an economic question with some math involved. I googled what the definition of ... | |
| Identities | 1/29/2009 |
| Q: how do i express i = 100sin(θ) + 150sin(θ + Π/3) as Rsin(θ ± α) and ... A: You want to express this as R*sin(x+y), i.e., as a single sine wave rather than as a sum of two of ... | |
| math | 1/28/2009 |
| Q: Equality of complex number > two complex numbers z_1=a+ib and z_2=c+id are said > to be equal ... A: Ok Pratap~ I will give it a shot: (->) Assume a + bi = c + di. Then a-c = di-bi = (d-b)i. ... | |
| dimensional analysis | 1/27/2009 |
| Q: hi i did you to show me how to get feet to miles A: It would help if I was given a particular problem but here I can make one up. Let's change 2,640 ... | |
| finance math problem | 1/26/2009 |
| Q: im having trouble with a question ive tried it but im not sure if i did it right.Can you please ... A: To get the sum of all the payments just multiply the payment by the number of months you are going ... | |
| finance math problem | 1/25/2009 |
| Q: im having trouble with a question ive tried it but im not sure if i did it right.Can you please ... A: I see you've asked me to check your answers but the questions are the sums and monthly payments and ... | |
| Modelling movment speed and direction of animals | 1/24/2009 |
| Q: I wonder if you cn help with this: Imaging the movement of a particle in x,y coordinate system, ... A: I am not sure what your math background is but it seems you have some trig background. You can write ... | |
| Developing skill in proof independently | 1/24/2009 |
| Q: I'm a young woman studying Honours Math, but originally was focussed in Biology in high school. I ... A: Wow Claire, I commend you for your well thought out and clear prose. I also admire your drive to ... | |
| Sale Price | 1/24/2009 |
| Q: I saw a furniture store commercial in which the salesman indicated that the furniture was on sale at ... A: Everything you said perfectly. For $.59 on the dollar is exactly for every $ in cost you will only ... | |
| Iterative methods | 1/23/2009 |
| Q: I'm stuck and i dont understand & how to apply the formula. Can you explain more about this topics & ... A: Ok here is the answer I came up with. You will need to be careful about your notation since ... | |
| math | 1/23/2009 |
| Q: sherry please tell me what is composite function? A: A composite function is a function applied to a function. The most simple composite function is when ... | |
| Developing skill in proof independently | 1/23/2009 |
| Q: I'm a young woman studying Honours Math, but originally was focussed in Biology in high school. I ... A: A good beginning is to learn the basic rules of logic usually found in a symbolic logic course. It ... | |
| College Algebra help | 1/22/2009 |
| Q: Determine the Difference Quotient where: DQ=[g(x)-g(9)]/x-9 when: g(x)=(4/3)x-9 A: I'm not certain what you mean by difference quotient. Is that what DQ is and if so is DQ ... | |
| Algebra 2 | 1/22/2009 |
| Q: I just started my 2nd semester of my online school and I am already having trouble with this part of ... A: You can not take the even root of any negative number. This means you cannot take the square (2nd) ... | |
| math question - maximum area of a triangle | 1/22/2009 |
| Q: two sides of a triangle are 5 and 11. What length for the third side will maximize the area of the ... A: After careful thought and consideration I think I have a solution method that does not require ... | |
| Modelling movment speed and direction of animals | 1/21/2009 |
| Q: I wonder if you cn help with this: Imaging the movement of a particle in x,y coordinate system, ... A: I have a few ideas for you. First the tanx = sinx/cosx and the only times cosx is 0 is when x = ... | |
| Integration problem | 1/20/2009 |
| Q: How to Integrate this ((x)/(x+2)^3) by parts. Much appreciated ANSWER: Hi Qi~ Is there some ... A: multiplying by (x+2)2/(x+2)^2 is just 1 and I chose it because I had ... | |
| Integration problem | 1/19/2009 |
| Q: How to Integrate this ((x)/(x+2)^3) by parts. Much appreciated A: Is there some reason (like in the problem statement or required as an instruction by your teacher or ... | |
| College Math | 1/19/2009 |
| Q: Good Morning Sherry, This is a homework question and I would appreciate any feedback as to whether ... A: The problem is done exactly right, I see no errors. I do have an observation though. You have marked ... | |
| function in math | 1/19/2009 |
| Q: sherry please teach me the surjective,injective,bijective function .please teach me A: Pratap~ I will try to explain these terms in simpler but less elegant mathematical vocabulary. ... | |
| Amount | 1/18/2009 |
| Q: A one inch rainfall goes on a 1000 square feet roof and the water is collected in rain barrels. ... A: Randy~ Volume or gallons are 3 dimensional and you have a two dimensional measurement and a one ... | |
| complex number | 1/17/2009 |
| Q: Equality of complex number two complex numbers z_1=a+ib and z_2=c+id are said to be equal if and ... A: Just out of curiosity, where did this proof come from? I ask because it is fallacious (wrong). ... | |
| Pre-calc word problem help | 1/17/2009 |
| Q: Here is the problem: J working alone can repair 2 sections of trail in r hrs. K working alone can ... A: I did the problem slightly different, however I do arrive at the same answer. J's rate is 1/3 job ... | |
| proof question | 1/16/2009 |
| Q: I signed up for abstract algebra this semester but I did not do proofs in a long time so I need some ... A: ..if gcd(a,b) = d then d can be written as a linear combination of a and b. Let's say d=ax+by. If t ... | |
| proof question | 1/16/2009 |
| Q: I signed up for abstract algebra this semester but I did not do proofs in a long time so I need some ... A: Sure I'd be happy to help you. You always want to establish the 'base' case, usually n = 0 or 1. By ... | |
| Homework | 1/14/2009 |
| Q: (256/x^12)^ -3/4 A: (256/x^12)^ -3/4 is the same as (256)^(-3/4)/(x^12)^(-3/4) Negative exponents need to be moved up ... | |
| combinations | 1/13/2009 |
| Q: how to find the 5th term of (y/4 - 2/y)^7 ANSWER: Janine~ Are you are familiar with Pascal's ... A: It is not clear what you are asking. If you are asking about the coefficient of the 5th term then in ... | |
| Proving Identities | 1/12/2009 |
| Q: How do you prove this statement? cosx/(secx-1)-cosx/tan^2x=cot^2x A: To prove this statement, take one side or the other and try to derive the remaining one. I chose to ... | |
| combinations | 1/11/2009 |
| Q: how to find the 5th term of (y/4 - 2/y)^7 A: Janine~ Are you are familiar with Pascal's Triangle? You can use that to try to figure out what ... | |
| Vertical asymptote with trinomial | 1/10/2009 |
| Q: i am stuck on finding the vertical asymptote of 3/(27x^3-8). I understand that it factors to ... A: Daniel~ We refer to the product of the sum or difference of two cubes as having the quadratic ... | |
| Functions. | 1/9/2009 |
| Q: 1. Let f be the function defined by f(x) = ln ((x+3)/(2x+1)) (a) Find the domain of this function ... A: The ln of a quotient is the differences of the ln so ln ((x+3)/(2x+1)).It looks like you know that ... | |
| function | 1/8/2009 |
| Q: sherry how can i finf the largest domail and range of a function.please tell me. if ... A: pratap, is it the sqrt(16) -x^2 or sqrt(16-x^2)? When you talk about the domain and range there ... | |
| function in math | 1/7/2009 |
| Q: let the function f:R→R be defined by f(x) =x^2+2.if A={x∊R:-2<x<-1},find f(A); please ... A: try putting in increasingly larger values for x and find out what you get for f(x) and remember f(x) ... | |
| function in math | 1/7/2009 |
| Q: if f={(1,5),(2,7),(3,9),(4,11)} be a function defined by f(x)=ax+b,then find the values of a and b; ... A: Choose any two of the ordered pairs (points) and use the point slope form of a line to write f(x) = ... | |
| function in math | 1/7/2009 |
| Q: sherry thanks for aneswaring my question if f(x)=2x^2-5x+4,then find the value of x for which ... A: Simply calculate 2*f(x) and f(2x) and set them equal to each other and solve for x to find the value ... | |
| function in math | 1/6/2009 |
| Q: let the function f:R→R be defined by f(x) =x^2+2.if A={x∊R:-2<x<-1},find f(A); please ... A: A is the set of all real numbers between -2 and -1, i.e., (-2,-1) in interval notation. That means ... | |
| Multivariable Algebra Systems of Equations | 1/4/2009 |
| Q: Heres the equations a = square root of (b + c) c = a^2 - e a = d - c e = d + c a = (d + e)/b ... A: This is in response to your question a = b^2, b = a - b: substitute a = b^2 into b = a-b getting b ... | |
| function in math | 1/4/2009 |
| Q: Let f:R→R be definerd by f(x)=x^2 If A={x:-1≤x<1}=[-1,1) then A⊆R And ... A: I believe I answered this already but maybe it didn't get sent so here it is again: Since x^2 + 2 is ... | |
| function in math | 1/3/2009 |
| Q: Let f:R→R be definerd by f(x)=x^2 If A={x:-1≤x<1}=[-1,1) then A⊆R And ... A: Let's give each statement a line number 1- Let f:R→R be definerd by f(x)=x^2 2- If ... | |
| Calculus III | 1/3/2009 |
| Q: Q: Find the maximum and minimum values of f(x, y) = xy on the ellipse 5x^(2) + y^(2) = 9. maximum ... A: Miss Adel~ I think I have an easier way to solve this problem so I will try to explain to you ... | |
| relation in math | 1/3/2009 |
| Q: Let A={1,2,3} . let R be a relation on A. Define R={(x,y)}є AXA:x|y} find R Soluction . ... A: A is the set containing the natural numbers 1,2, and 3. A relation is just a rule that operates on a ... | |
| Calculus III | 1/2/2009 |
| Q: Q: Find the maximum and minimum values of f(x, y) = xy on the ellipse 5x^(2) + y^(2) = 9. maximum ... A: Miss Adel~ As I follow your process to solve for x I see nothing wrong until the step where you ... | |
| absoulte value | 12/31/2008 |
| Q: |a|≥a and |a|≥a Proof if a≥0 then |a|=a If a<0 then |a|=-a>a aєR ... A: Ok Pratap~ About the statement (If a<0 then |a|=-a>a): If a < 0 then "a" is a negative number. ... | |
| absoulte value | 12/29/2008 |
| Q: |a|≥a and |a|≥a Proof if a≥0 then |a|=a If a<0 then |a|=-a>a aєR ... A: Did you write this correctly? The first statement is repeated. In the first line of the proof it is ... | |
| function in math | 12/24/2008 |
| Q: please tell me what is function? A: What is a function in math? A function is a relationship between two quantities that gives you one ... | |
| Percentages & Interest Rates | 12/23/2008 |
| Q: Here is myAn investor has $30,000 to invest at simple interest, one portion at 2% and the other at ... A: It is still unclear why you would want to divide by 5%. Essentially you are going to be earning 2% ... | |
| Percentages & Interest Rates | 12/18/2008 |
| Q: Here is myAn investor has $30,000 to invest at simple interest, one portion at 2% and the other at ... A: You can use algebra to find a "non-algebraic" way to your answer. Since you are earning an ... | |
| relation math | 12/18/2008 |
| Q: A relation R on the set Z of integers given by R={(x,y):2|(x-y)} is an equvalance relation. ... A: There are three things you need to show in order to say something is an equivalence relation. The ... | |
| Pre-Calc | 12/16/2008 |
| Q: Can you show me the step by step process for answering this question. ... A: The way to simplify the is problem is to find the common denominator. If you wanted to add 3/8 + 1/3 ... | |
| Maths | 12/15/2008 |
| Q: 1)85%, 22%, 22%, 29% (does not equal to 100%) do i just do the normal average wok out where i add ... A: Percents in data do not have to add up to 100%. Suppose you have those values for tests grades, what ... | |
| Need help for trig final | 12/15/2008 |
| Q: I have 2 questions on my review for my final that I am stumped on. 1. Verify the identity: (1/1-cos ... A: So you have r - sint = -7cost multiply everything by r getting r^2 -rsint = -7rcost recall y = ... | |
| Math Question | 12/15/2008 |
| Q: Robert can mow the lawn in one hour less time than Ed. Together they can finish the job in 5 hours. ... A: This is a standard type work = rate*time problem, however it doesn't work out nicely. You are given ... | |
| Math Question | 12/15/2008 |
| Q: Robert can mow the lawn in one hour less time than Ed. Together they can finish the job in 5 hours. ... A: Ozzie~ I just answered this question, are you Robert also? Regardless here is the answer I gave ... | |
| Need help for trig final | 12/14/2008 |
| Q: I have 2 questions on my review for my final that I am stumped on. 1. Verify the identity: (1/1-cos ... A: Clarissa~ For the first question just find a common denominator for the left hand side and then ... | |
| Improper Integrals | 12/14/2008 |
| Q: I am having trouble solving this problem: Find the p values for which 1/(x*ln^p(x)) is improperly ... A: Megan~ Hi. If you meant INT[dx/(x*(lnx)^p)] = -1/[(p-1)(lnx)^(p-1)], p not = 1, then you find ... | |
| length of a parametric curve | 12/13/2008 |
| Q: x=(cos(t))^3 y=(sin(t))^3 what is the length of the parametric equation from 0 to pi? I am more ... A: Ok C. J. Here you are: If x = cos^3t then dx = 3cos^2t(-sin t) dt or dx/dt = 3cos^2t(-sin t) so ... | |
| As-level maths | 12/13/2008 |
| Q: 1. Solve the inequality: 10 + x² > x(x – 2) 2. The fifth term of an arithmetic series is 14 and ... A: 1. Solve the inequality: 10 + x² > x(x – 2)expand right hand side 10 + x² > x²-2x subtract 10 from ... | |
| Math | 12/11/2008 |
| Q: There are 300 tickets sold. The total revenue of 1336.00 Tickets cost $3 for students and $5 dollars ... A: The first thing you want to do is to write the linear equations that describe the conditions. There ... | |
| Math Foundations Proofs | 12/11/2008 |
| Q: Prove that the non-zero element [a] of Z(integers)sub n, has a multiplicative inverse in ... A: Ok, let's make a stab at it: (-->) Suppose a,b != 0 in Z_n such that ab = 1 mod n then n|(ab-1) ... | |
| Mathematical methods for science1 | 12/10/2008 |
| Q: 1. Determine the volume of the solid of revolution obtained when the curve F(x) =x2+5 Is rotation ... A: Please see additional info below: Hi Emer~ I am going to assume you mean by x2: x-squared. ... | |
| logarithms | 12/10/2008 |
| Q: please help me find the sum/difference of log5[x2/y7] and log5 square root rs/9 A: Hopefully we are communicating on what the problem is, this is what I think you meant: log (base 5) ... | |
| Calculus double integrals with variable intervals | 12/8/2008 |
| Q: I know this shouldn't be that much harder than the double integral problems with fixed number ... A: This is a very "messy" problem, but let's try getting through it without making any careless ... | |
| Solving functions to get domain | 12/8/2008 |
| Q: f(x)=4/(x^9-256x) A: I am going to assume you are looking for the domain of the function you gave. The domain is all ... | |
| Inequality | 12/7/2008 |
| Q: The problem I was given was to solve for "x" algebraically when (x+5) divided by (x-3) is greater ... A: This is a problem with reasoning and math. What do you know about when a number (a rational number, ... | |
| Logarithm | 12/7/2008 |
| Q: I am just a bit confuse about this problem, could you please assist.. Here is the problem: Write the ... A: First off this is a difference of two logs of the same base so you can write it as a quotient of the ... | |
| Precalculus Questions | 12/6/2008 |
| Q: HELP! Two precalc problems, one of which I have an answer to that does not seem right. 1. Given the ... A: Next time show me how you worked the problem so I can tell you where you made your mistake. That is ... | |
| calc | 12/6/2008 |
| Q: A newspaper is launching a new advertising campaign in order to increase the number of daily ... A: You are given an ordered pair (time, subscribers)= (t,s) and you are also given that you have 26,000 ... | |
| Trigonometric Identities | 12/4/2008 |
| Q: I am having problems solving a few trigonometric identities. If you could help, I would really ... A: 1- sin^2(x)/(1-cos x) = (1-cos^2(x))/(1-cos x) (to see this just multiply top and bottom by ... | |
| Math | 12/3/2008 |
| Q: I have a question that I've been stuck on for quiet awhile, I was hoping you could help me. I need ... A: I am assuming you are in elementary algebra by this question. Can I assume you are just earning ... | |
| metric system | 12/2/2008 |
| Q: convert 36,960 ft. to miles. A: So you want to convert ft to miles. You need a conversion factor which is 5,280 per 1 mile which is ... | |
| Please check my answer and 1 question | 12/1/2008 |
| Q: Rearrange the expression to make r the subject. my answer is s = 4 pi r^2 s/(4 pi) = r^2 ... A: Your answer could be simplified some more in part 1. When you take the sqrt you need to state that ... | |
| algebra 3 word problems | 12/1/2008 |
| Q: Solve the following word problems by setting up and equation. Show all work. 1. Sara and Elizabeth ... A: I am going to start with #5 because it is a standard word problem in algebra using a system of ... | |
| Calculus | 12/1/2008 |
| Q: Carla Music Company estimates that the marginal cost of manufacturing its professional series guitar ... A: To find the total cost, you need to integrate C prime which is given to you as .002x+ 100. Now they ... | |
| Pre Calculus | 11/30/2008 |
| Q: Find the angle (* theta) between two non-vertical lines L1 and L2. The angle (*theta) satisfies the ... A: I am going to assume that the tan(theta) = |(m2-m1)/m2*m1| You say to assume m1m2 does not equal 1, ... | |
| calculus | 11/30/2008 |
| Q: Consider the third-degree polynomial f(x)=ax^3+bx^2+cx+d, a≠0. Determine conditions for a, b, ... A: Bill~ To obtain a horizontal tangent you need to take the first derivative and find the ... | |
| Integration | 11/29/2008 |
| Q: Can you help me with the "indefinite integration of the square root of cosine(x)"? I have tried ... A: What an interesting question, it has motivated me to find an answer to this myself. I do not have ... | |
| LIMITS(CALCULUS) | 11/28/2008 |
| Q: Lim [sin(3x+a)-3sin(2x+a)+3sin(x+a)-sin(a)]/x^3 x->0 A: First you want to rewrite sin(3x a) using the trig identity sin (a b) = sin a cos b cos a sin b ... | |
| algebra 3 | 11/26/2008 |
| Q: Find the equation of the given line(in standard form) 1. The line that passes through the points ... A: All lines have a slope called "m" =(y2-y1)/(x2-x1)where (x1,y1) is one of the points and (x2,y2) is ... | |
| Alternate Solution | 11/26/2008 |
| Q: A few days ago I asked how to determine the solution to the following by using a weighted average: ... A: There are actually a number of ways to obtain this information but not knowing what your mathematics ... | |
| locus | 11/25/2008 |
| Q: hey..i really needed help with how to figure out the equation of a parabola if the focus and vertex ... A: y^2=4ax is the equation of a parabola with vertex at (0,0) and focus at (a,0). The directrix is ... | |
| simplifying | 11/24/2008 |
| Q: simplify: a^-6 b^10 divided by 5c^7 d^-2 A: I tell my students to think of the numerator as the attic and the denominator as the basement and ... | |
| Application of Disk/Washer System | 11/24/2008 |
| Q: What are the real life applications of the disk/washer integration system to find volume in ... A: Here is one example and there are many more: A CAT scan produces equally spaced cross-sectional ... | |
| Distance | 11/23/2008 |
| Q: A bullet is fired at a target 4400 feet away. At what point along the path is the impact of the ... A: try this: Let s be the distance from where the gun is shot along the line to the target. Calculate ... | |
| sequences | 11/23/2008 |
| Q: Explain the sequence and what is the next number? 1,11,21,1211,111221.... this is on 6th grade ... A: * Find the next number in the following sequence: 1, 11, 21, 1211, 111221,.... This ... | |
| Implicit differentiation | 11/21/2008 |
| Q: i'm stuck with this question, i'm not really understood this topic, i dont know when to apply this ... A: First you need to find the 2nd derivative y". By the way, it is called implicit differentiation ... | |
| Weighted Averages | 11/20/2008 |
| Q: Can you solve the following by using a weighted average calculation? An investor has $30,000 to ... A: I tell my students to set up a table of values and to label the variable let x = amount invested at ... | |
| About Implicit differentiation | 11/19/2008 |
| Q: i have tried and i'm stuck, i dont know what kind of formula 2 use anymore.. I dont know when to ... A: I can help you with part b since I believe that problem is correctly written. You are given 3x^2 ... | |
| Weighted Averages | 11/19/2008 |
| Q: Can you solve the following by using a weighted average calculation? An investor has $30,000 to ... A: I'm not sure what you are wanting to know. Are you wanting to know if the problem can be solved ... | |
| alg | 11/18/2008 |
| Q: Graph and give me the points for the following parabolas and hyperbolas. For parabolas, list the ... A: First off 2 and 4 are parabolas. Do you know what a parabola looks like? They look sort of like an ... | |
| log | 11/18/2008 |
| Q: x=log(3) 27 How do I figure this out? Thanks! A: The base is 3. You might want to review the definition of a log but basically this translates into: ... | |
| analysis ? | 11/18/2008 |
| Q: Prove that if f(x) = e^x, then (a) f(x) is strictly increasing for all x in R; (b) lim as x goes to ... A: Take the derivative of e^x and it is of course e^x > 0 for all x so e^x is strictly increasing. lim ... | |
Advanced Math
Answers by Expert:
Sherry Wallin
Top Expert on this page
Expertise
I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.
Experience
I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.
Education/Credentials
I have taught 12 years at the community college level, medical college, and technical college as well as a high school instructor and alternative education instructor and charter school instructor.
Awards and Honors
Master's GPA 3.56
Bachelor's GPA 3.34
Post grad work not degree related GPA 4.0
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