Algebra - Math for Kids - Science

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About Bobby Soltani
(Top Expert on this page)

Expertise
I can help with all types of questions in algebra, geometry, trigonometry, and calculus. I can answer general physics questions. I can also help simplify and solve word problems.

Experience
I have been a math and physics tutor in college for 3 years.

Education/Credentials
Bachelor's and Master's degrees in Electrical Engineering.

You are here: Experts > Science > Math for Kids > Algebra

Questions Answered By Expert Bobby Soltani
In Category Algebra

Subject	Date Asked

algebra trouble with a seemingly easy question!!	10/11/2009
Q: I really need help with this question because at first I though I could solve it in a snap but...I ... A: SQRT(2x+7) - x = 2 add x to both sides SQRT(2x+7) = x+2 Square both sides 2x + 7 = x^2 + 4x + 4 ...
algebra	10/10/2009
Q: Which pair of numbers has a GCD that is a prime number,70 and 112 or 68 and 187? A: The Greatest Common Divisor is the largest integer or common divisor that divides 2 or more ...
ALgebra	10/9/2009
Q: Find the slope of a line determined by the equation: x+y/-3+13=9. Answer in simplest form, please. A: One way we can find the slope of an equation is to arrange the equation in slope-intercept form: y ...
Algebra	8/23/2009
Q: Is 2sqrt of 3 + 5sqrt of 3 = (2 + 5)*sqrt of 3 an associative property of addition? A: That is actually the distributive property of addition. The Distributive Property is easy to ...
word problem	8/20/2009
Q: If Thumbelina's team can build a prefabricated home in 15 hours and Rumpelstillskin's team takes 10 ... A: Thumbelina's team has a "house building rate" of 1 house per 15 hours or 1/15 houses/hour. ...
Roots of an equation	8/15/2009
Q: I recently came acros the following type of equation: (x - 2)/(x - 1) = (x^2 + 6x + 4)/(x - 1) ... A: When you multiply both sides of an equation by an expression which includes the variable, you run ...
algebra review	8/14/2009
Q: the first one is how to solve for the given variable: solve for y: 3x+5y= 15 the answer is y= ... A: The trick to the first one is to perform steps on both sides of each equation to isolate the ...
Interest & Percentages	8/13/2009
Q: How can I determine the answers for the following? An investor wants to divide $1000.00 into two ... A: Percentage means "per 100", so 50% means 50 per 100, or simply 50/100. If you divide 50 by 100 you ...
algeabra	7/24/2009
Q: write each expression using positive exponents. 4^3, 6^2, 7x^-3, (7x)^-3 A: The exponents are positive on the first two, so I'll help with the last two expressions. Property ...
Interest & Percentages	7/23/2009
Q: How can I determine the answers for the following? An investor wants to divide $1000.00 into two ... A: P1 and P2 represent the interest rates (or percentages). Since 4% is equal to 0.04, I multiplied ...
Interest & Percentages	7/22/2009
Q: How can I determine the answers for the following? An investor wants to divide $1000.00 into two ... A: There are actually several percentages that will earn a total of 4.4%. You set up the equation ...
Algebra Application	7/20/2009
Q: I need help in solving this problem The cost in millions of dollars, to remove x% of pollution in a ... A: I couldn't tell exactly what your equation was supposed to look like because of the formatting, but ...
College Algebra	7/18/2009
Q: The sum of two numbers is 71. The second is 6 more than 4 times the first. What are the two ... A: These types of problems are sometimes called "two equations two unknowns" type problems. There are ...
Alg. 2 review	7/17/2009
Q: i have a few problem that my pre-cal. teacher want us to do over summer break and i got stuck on a ... A: I'll pick out a couple of these and solve them so you'll get the idea. 12x^2 - 48 = 0 isolate the ...
Linear equation woed problem	7/11/2009
Q: Suppose you have a lemonade stand, and when you charge $2 per cup of lemonade you sell 120 cups. ... A: a. Write an equation for the number of cups you sell as a function of the price you charge. We ...
Applications Problem - Algebra	7/9/2009
Q: Avoiding a Collision A car is traveling on a road that is perpendicular to a railroad track. when ... A: 40 meters. The hint is that the road is perpendicular to the track, so you're working with a right ...
square root method	7/7/2009
Q: .i have this problems from my mat1033 class .. I want to know if i have the correct answers so can ... A: Sorry it took me a few days to get back with you. (2x-7)^2= 14 take the square root of both sides ...
Algebra----long division by binomials	7/5/2009
Q: Problem (3^3-x^2+10x-4)/(x+3). I don't understand the concept of how to solve this problem or any ... A: Long division of a polynomial by a binomial is carried out in essentially the same manner as long ...
radical expressions	7/3/2009
Q: I am lost, I have to write a radical expression about what my salary will be in 10 years? Can you ... A: I'm not sure what is meant by a radical expression about what a salary would be in 10 years. If you ...
word problem struggle	6/29/2009
Q: trying to start a new career, and was humming along through algebra until I hit this problem... An ... A: Let the amount invested at 9% be x, and the amount invested at 10% be y. An actor invests x at 9% ...
pool temp	6/23/2009
Q: I have 19,000 gallon pool with a water temp. of 70 degrees fahrenheit. I add 50 gallons of water ... A: Let the volume v1 = 19000 and the temperature t1 = 70 Let the volume v2 = 50 and the temperature t2 ...
Question about linear equations	6/21/2009
Q: I am completely lost in the area of algrebra. I am hoping you can explain, if possible, how to solve ... A: 1) Qd = 9 - P 2) Qs = -5 + P 3) Qs = Qd Substitute 9-P for Qd in equation 3, and -5+p for Qs in ...
algebra (probability)	6/19/2009
Q: 1)From a group of 125 boys and 150 girls, what are the odds of randomly selecting a girl? ... A: The probability of an event is equal to the number of favorable outcomes divided by the number of ...
Calculus AP Entrance Exam	9/9/2006
Q: I want to know how can you tell if a function is even, odd, or neither? Thanks A: Odd Function--a function “f” is an odd function if: f(-x) = -f(x). Example: f(x) = x^3 f(-x) = ...
Word problem help	9/5/2006
Q: I would appreciate it very much if you could help me with a word problem that requires using a ... A: Let the number of cards that Tom has be t, ken is k, jill j, and randy r. Tom has 9 more than Ken ...
algebra	9/4/2006
Q: please tell me how to work out the y intercept and gradient of an an algebra linear equasion... A: To find the y-intercept and gradient of an equation, you want to get the equation into the form: y ...
two problems i hope u can answer.	9/3/2006
Q: Q: In an evening, a sporting goods store sold twice as many T-shirts as shorts. T-shirts are $9 ... A: In an evening, a sporting goods store sold twice as many T-shirts as shorts. T-shirts are $9 each, ...
input/output bars	9/1/2006
Q: I am a parent who is trying to help our daughter with a function that contains two rows: The Input ... A: I'm not sure exactly what your specific problem is asking, so my answer will be somewhat general. ...
Use a propotion to solve.	5/12/2006
Q: Triangle ABC is similar to triangle XYZ.The length AB is 10.The length BC is 7.Find the length XY if ... A: The ratio of AB to BC should be the same as XY to YZ. We can write this as AB/BC = XY/YZ We need ...
word problem. HELP!	5/4/2006
Q: Four holes are drilled in a straight line in a rectangular steel plate. The distance between hole 1 ... A: Let the gap between 1 and 2 be x. Let the gap between 2 and 3 be y. Let the gap between 3 and 4 be ...
confusing algebra word question	4/29/2006
Q: The number of cubic inches of volume in a rectangular box is 351. The number of square inches on the ... A: Let the length of the box be L, the width W, and the height H. The surface area is equal to the sum ...
Determine Gross Profit	4/24/2006
Q: How is the gross profit determined for the following? If a store's merchandise inventory on April 1 ... A: Gross profit = sales - cost of goods Sales = 66071 Cost of goods = purchases for the 3 month ...
% and point	4/23/2006
Q: Bobby, My problem states this. Patti needs at least a 70 to pass her grade. Right now she has a ... A: I'm not sure exactly what the question is asking. I'll assume that she has 49.58 points in her ...
can't figure this out	4/20/2006
Q: This is from an assignment and it is killing me i just can't figure it out. i have worn my book out ... A: I'll represent the exponents using the ^ sign. For instance, x squared will be x^2. -10x^4 - 7x^2 ...
algebra	4/18/2006
Q: Explain how you can tell whether to draw a solid or a dashed boundary line when graphing a linear ... A: You draw a solid boundary line when there is a line under the greater than or less than sign. That ...
common factors	4/17/2006
Q: How do you determine the common factors in an expression? I need an example please! A: FACTORING POLYNOMIALS A factor of a quantity N is any expression which can be divided into N ...
Averages & Fractions	4/5/2006
Q: Is it possible to determine the averages for fractions? For example, what is the simple average for ... A: The average for fractions can be calculated in the same manner as the average for any numbers. The ...
Help Solving a Three equation word problem	4/3/2006
Q: I have this problem that I am stuck trying to figure out the answer: Hal gives Tom as many raffle ... A: This is a confusing problem. It is best to work backwards from the last transaction. If they each ...
peter and sandra have collected...	3/27/2006
Q: peter and sandra have collected 65 postcards of famous bridges. peter has 5 more postcards than ... A: Let the number of postcards that peter collected be "p" and the number of postcards sandra collected ...
Using basic number ideas	3/22/2006
Q: The local buisness club has 270 members. Its rules state that two-thirds majority is needed to amend ... A: First we need to find out what is 2/3 of 270. To do this, we multiply 270 by 2/3. 270 x 2/3 = ...
conbersion	3/22/2006
Q: Determine the number of square feetina square yard. Determine the number of cubic feet in a cubic ... A: To get square feet, you need to multiply the length of an area by the width of an area. There are ...
The distance of an object	3/12/2006
Q: The distance an object falls is directly proportional to the square of the time it has been falling. ... A: From the first sentence, we can write D = a(t^2) Where D is the distance, t is time, and a is a ...
Word Problem	3/10/2006
Q: Two stock investments cost $15,000. One stock then had a 40% gain and the other a 10% loss. If the ... A: Let's let amount initially invested in the stock with the 40% gain be "a", and the one with the 10% ...
algebra	3/8/2006
Q: can you please explain: if 3x-2=2y and y=3z+5, what is = to x A: I'm not sure exactly what you are asking. You can solve the first equation for x. 3x - 2 = 2y 3x ...
Algebra 2	3/6/2006
Q: How would you graph this equation: (x-4)2=y+7 A: First, get the equation into point-slope form. That form looks like this: y = mx + b where m is ...
Algerbra	3/5/2006
Q: What is the area of a cylinder? A: To find the surface area of a cylinder add the surface area of each end plus the surface area of the ...
algebra	3/3/2006
Q: if the line passes through points (0,5) and (-2,9) the equation for the line is what? can you ... A: The equation for a line can be written as: y - y1 = m(x - x1) where (x1,y1) is a point on the line ...
Algebra	2/23/2006
Q: Consider the line with equation 10 x + 8 y = 40 a.What is the slope of the line? b. What is the ... A: To find the slope and y intercept, it is easiest if we get the equation in the form y = something. ...
algebra	2/21/2006
Q: what does this simplify to? 1 1 over + over 2x 2x A: When you have the same denominators (bottom), you can add the numerators (top). 1/(2x) + 1/(2x) = ...
MATH	2/20/2006
Q: The formula c+80=2F models the relationship - 2 ... A: The formula is (c/2) + 80 = 2F Here we have two variables, the number of chirps per minute (c) and ...
Scientific Notations	2/14/2006
Q: Write 123456789 in scientific notation and write .00001234 in scientific notation. In the first ... A: You want to move the decimal so that the resulting number is between 1 and 9.99999... When you move ...
factorising	2/12/2006
Q: x^2-4x-77 A: x^2 - 4x - 77 77 can be broken into 7*11, so we write (x 7)(x 11) We need to determine ...
algebra	2/9/2006
Q: can you explain to me what the pythagorean theory is please!?!?! A: In mathematics, the Pythagorean theorem or Pythagoras' theorem is a relation in Euclidean geometry ...
algebra	2/8/2006
Q: prove the following: the sum of two odd numbers must be even. start by just figuring out why the ... A: The sum of two odd numbers is an even number: Proof: Let 2k + 1 and 2j + 1 be two odd numbers (here ...
finding the slope	2/7/2006
Q: How do I find the slope of the line through (8/5,1/3) and (9/5,2/3) I tried to set it up using the ... A: To find the slope, use the following equation: m = (y2 - y1)/(x2 - x1) where (x1,y1) are the ...
Math Scavenger hunt	2/6/2006
Q: My daughter has a Scavenger Hunt/math quiz that we are totally stumped on. The internet is part of ... A: It looks like you are doing everything right. I would check your answers for q and w, and any other ...
Algebra	2/2/2006
Q: A man buys some plates 2/3 of them are craked, 1/2 of them are chipped and 1/4 of them are chipped ... A: Let the total number of plates be x. (2/3)x are cracked (1/2)x are chipped (1/4)x are chipped and ...
solving for y	2/1/2006
Q: 6y-7+6(7y-1)=35 A: 6y-7+6(7y-1)=35 Distribute the 6 through the parentheses by multiplying it by each term. 6y - 7 + ...
fractional parts of numbers	2/1/2006
Q: can you please explain this one to me step by step so I know how you get the answer thanks what ... A: Let's start with a simple example. If I asked you what fraction of 10 is 8, the answer would be ...
fractions	1/31/2006
Q: how do i solve 3/7=3t/4+1 and the library closes in 15 minutes and the answer is supposed to be ... A: It looks like the allexperts website was having some troubles because I just received your question. ...
i got a question on math	1/27/2006
Q: i need to know what 3 1/4 x 2 1/3= and how did you get the answer please and thank you A: First, write the two fractions in improper form. 3 1/4 = 13/4 I got this by multiplying the 3 by ...
please explain	1/24/2006
Q: 3x+2-x+4=-5-x-4 A: 3x+2-x+4=-5-x-4 combine all the terms on each side that have x (3x - x) + (2 + 4) = (-5 - 4) - x ...
simplify	1/22/2006
Q: lesson 9 can you tell me if these are correct thanks 4*3+2+(-3)5 12+2+(-3)5 12+2+(-15) 14+(-15)=-1 ... A: Nice work. I think you got all of them correct. On one of them, you wrote a plus when you meant a ...
evaluate	1/20/2006
Q: can you help me on these thanks.lesson 20 number (27),(29) a-b(a^2-b) if a=-2 b=3 and this one also ... A: a-b(a^2-b) if a=-2 b=3 and this one also (-2)-(3)((-2)^2 - 3) square the -2 (-2)-(3)(4 - 3) ...
How to Simplify	1/19/2006
Q: I'm trying to solve this alebra problem. Any help appreciated. This is not a homework question - ... A: I wasn't sure if you needed all the steps. Here they are. M = F/ (F - S1) I know that 1/F = 1/S1 ...
Simplify	1/17/2006
Q: are these correct 5-3(-2+6)-(5-7)-2 2(4)-(-2)-2 8+2-2 10-2=8 ------------------ -3(5-3)-(-2)(-6-1) ... A: 5-3(-2+6)-(5-7)-2 first simplify all the parenthesis 5 - 3(4) - (-2) - 2 then multiplication 5 - ...
equation of the line	1/14/2006
Q: my finals are coming and i cant afford a tutor can you please be so kind as in to help me i would ... A: I'd be glad to help. * write the equation of the line wich contains (-3,1) and whose y-intercept is ...
please explain	1/13/2006
Q: Please explain this one to me +\|-2-3\|-4+(-8) A: Follow the order of operations to solve this problem. P - parentheses (and absolute value ...
What is the answer to 11y...	1/10/2006
Q: What is the answer to 11y plus 13 >greater than or equal to negative 1? (It is inequalities) ... A: Solve this problem just as if the greater than sign was an equals sign except that you must change ...
Algebra 2	1/9/2006
Q: I need help learning how to use the quadratic formula to solve equations in the standard form. Here ... A: The quadratic equation is (-b +- SQRT(b^2 - 4ac))/(2a) where the equation is written as ax^2 + bx ...
Algebra question	1/8/2006
Q: Simplify. r - 5 r² - 25 ------ * ------ r + 5 5 - r I don't know what to do here. ... A: You first need to recognize that r^2-25 is in the form a^2 - b^2, where a = r, and b = 5. When you ...
Algebra question	1/5/2006
Q: Simplify. -85a³b²c² -------- -34ab³c² I seriously do not know how to get the answer to this ... A: You are very close. The answer should be 2.5a/(b), or you can write it as 2.5a*(b^-1), or ...
Alg. 2 Problem	12/28/2005
Q: what does the x equal in the soulution of the system of equations below ? y=2x+2 y=1/2x+5 A: There are several ways to solve this problem. Here's one. 1. y = 2x+2 2. y = 1/2x+5 substitute ...
algebra word problem	12/26/2005
Q: This deals with direct and constant variation. The revenue for a sandwich shop is directly ... A: I hope this will help you understand the problem. Two quantities, A and B, are in direct proportion ...
algebra	12/23/2005
Q: simplify: 1) xy-4xz+2xy-3xz 2)4a squared- b squared if a = 9;b= 4 A: 1) xy-4xz+2xy-3xz group the terms that have the same variables together. For example, group the ...
algebra question	12/20/2005
Q: bobby you helped me one before so I'm back again. can you help me with 144x^2y^2 divided 3x^4 times ... A: (144x^2y^2)/(3x^4) * (2x^4)/(7y^3) First break the numbers down into their smallest components. ...
Practive4.7A	12/18/2005
Q: A vending machine that takes only dimes and quarters contains 30 coin,with a total value of $4.20. ... A: This is one of the problems where you have two unknowns, so you need two equations to solve them. ...
Evaluate the expression -5...	12/17/2005
Q: Evaluate the expression -5 + 6 - 12 + 4 A: Do this one from left to right, one step at a time. -5 + 6 - 12 + 4 -5 + 6 is the same as 6 - 5, ...
solve by completing the square	12/15/2005
Q: -x^+4x-1=0; m^=2/3m+4/9 ^=square /=over (fraction) A: -x^2 + 4x - 1 = 0 multiply everything through by -1 to get a positive sign on the x^2 term. x^2 - ...
quadratic equation	12/13/2005
Q: six r square - r - 2=0 solve for r should have two solutions A: You can solve this problem using the quadratic formula. root #1 = (-b + SQRT(b^2 - 4ac))/(2a) root ...
Algebra	12/9/2005
Q: What value of b makes the expression b+2=2b equal? A: To solve these problems, you want to manipulate the expression until it looks like b = something. ...
Algebra-Finding the domain of a function	12/6/2005
Q: How do we do these problems? y=1 ____ x + 2 y=1 ____ 3x A: The domain of a function is all values of x where the function is defined. When you have functions ...
centre of mass	12/5/2005
Q: How do you go about answering this question? "Prove that the centre of mass of a uniform wire in the ... A: The proof to this involves calculus. Since it is hard for me to express integrals in this text only ...
Algebra question	12/4/2005
Q: Just wondering if you could help me with this one algebra problem. Z 3power-5Z 2 power + Z-5 A: These problems take some practice before you can do them quickly. I assume that you want to factor ...
Two Buildings	11/27/2005
Q: Two buildings are seperated by an alley. Tom is looking out of a window 60 feet above the ground in ... A: To solve this problem, we need to first draw a picture. Draw the first building on the left. Then, ...
FOIL	11/25/2005
Q: This problem confuse me. I can't figure out how to apply the FOIL method and work it through. this ... A: F - multiply the first two terms together O - multiply the outer two terms together I - multiply the ...
2 ACT Questions	11/24/2005
Q: Can you explain how to come up with the follwing: 1. What is the maximum number of distinct ... A: 1. First, draw a hexagon. Then, from a single point draw all diagonals from that point. You will ...
Algebra	11/20/2005
Q: Simplify by combining like terms: 3[x – y(3x + 2y) + 2y2] A: 3[x – y(3x + 2y) + 2y2] multiply the y through the 3x and the 2y. 3[x - 3xy - 2y^2 + 2y^2] ...
factoring	11/15/2005
Q: c^2-49 HOW DO YOU SOLVE THIS? A: There are several properties of factoring that you just need to memorize. Relevent for this ...
algebra	11/13/2005
Q: -2 --> 1 0 --> 2 2 --> 3 4 --> 4 x ->__________ What is the one albebraic equation ... A: First, graph the points on a graph. The equation for a line is y = mx + b where b is the ...
Algebra Inequality	11/10/2005
Q: DESCRIBE THE STEPS NEEDED TO SOLVE EACH INEQUALITY -3p+4<P-5 A: Solve the inequality just as you would if there was an equals sign instead of a "less than" sign, ...
Percentage Calculation	11/7/2005
Q: If (5% X $1.00) + (2% X $1.00) = 3.5% X $2.00 or ($0.07/$2.00) = 3.5% what amount multiplied by 5% ... A: what amount(x) multiplied by 5% plus what amount(y) multiplied by 2% will equal 4% X $3.00? Here is ...
algebra	11/3/2005
Q: A line counting the points (9,1) and (5,5) intersects the x-axis at what point? A: There are several ways to solve this. Here's one. point 1 (x1,y1) = (9,1) point 2 (x2,y2) = (5,5) ...
Difference Quotient	11/1/2005
Q: Find the difference quotient for f(x) 2x^2 - 3x Evaluate it at x=3, h=0.1 A: the difference quotient is: (f(x+h) - f(x))/h f(x) = 2x^2 - 3x f(3) = 2(3)^2 - 3*3 = 18 - 9 = 9 ...
Pre-Algebra	10/29/2005
Q: I am taking Pre-algebra for the first time (math and I don't agree)and I have a question at the end ... A: When you solve these types of problems, you want to follow the proper order of operations. For this ...
Algebra 2 word problem	10/27/2005
Q: Stephen can ride to Grandma's house by bicycle in 3 hours. When he rides his snowmobile, the trip ... A: For this problem we need to know that distance traveled equals speed multiplied by time. Stephen ...
word problem	10/23/2005
Q: The Royal Fruit Company produces two types of fruit drinks. The first type is 50% pure fruit juice, ... A: Let the amount of 50% solution be x, the amount of 75% solution be y, and the total amount of ...
inequalities	10/21/2005
Q: the absolut value of 5x-2<-2 and 4- the absolute value of 3x-1>1 i gotx<0 and x<4/5 for the ... A: Could you use parentheses to indicate where the absolute value bars are? For instance, for the ...
Rational Expressions with Like Denominators	10/20/2005
Q: t/3 + t-5/3 A: (t/3) + t - (5/3) the common denominator is 3 in the first and third term. Multiply the second ...
TRIG	10/18/2005
Q: There were some definitions and stuff I had for homework and I couldnt figure out this one..... ... A: A set of points in the plane is the graph of a function if and only if no vertical line intersects ...
Algebra	10/15/2005
Q: Admission to a baseball game is $3.50 for general admissions and $6.50 for reserved seats. The ... A: I have answered another question that is very similar to your problem. Here is the solution to that ...
Algebra Equation	10/14/2005
Q: I'm not certain how to solve the following: 0.08x + 0.075y = $464 x + y = $6000 Can you ... A: 0.08x + 0.075y = $464 x + y = $6000 Solve the second equation for x by subtracting y from both ...
algebra	10/10/2005
Q: 2x/5=x/3+4 A: (2x)/5 = x/3 + 4 subtract x/3 from both sides (2x)/5 - x/3 = 4 multiply the first term on the left ...
geometry-solid-prism & cylinders	10/9/2005
Q: if the base area of right circular cylinder is 7 sq cms & its volume is 77 c.c,find its height & ... A: Let's first write out the applicable formulas. V = (pi)(r^2)(h) B = (pi)*(r^2) where B is base ...
elementary algebra	10/7/2005
Q: Price + Tax = Total, If Price is $10 and Tax is 9.5% and this equals $10.95. What would be the ... A: We can solve your problem using the formula you first wrote. P + t = Total tax is equal to P*r, ...
Physics Confusion	10/6/2005
Q: My last two years of HS (11-12th grade) will be home school for me. And my Physical Science courses ... A: Here are some equations you need to solve this problem. Force equals mass times acceleration F = ma ...
I have this problem to solve: Movie...	10/5/2005
Q: I have this problem to solve: Movie theater sells 155 tickets. Adults, $6.00 each Children, $4.50 ... A: You are on the right track. 6x + 4.5y = 935 where x = number of adult tickets, and y = number of ...
dividing a circle	10/1/2005
Q: I need to draw a cogwheel (needs to be accurate). I think that involves dividing a circle into equal ... A: Here is one way you can make the drawing. Get a compass and draw a circle. Using a ruler, draw a ...
algebra	9/26/2005
Q: 15x - 4y + 3z - z - 11x + 5y - y - 4x + z = A: For these types of problems, you can combine the terms that have the same variable. For instance, ...
Hello	9/16/2005
Q: My question isn't so much about how to do certain things in math, but rather how useful it is in ... A: Career goals aside, I think a certain level of math is important for everyone's personal life. For ...
algebra,,,,,,quadratic equations.....	9/9/2005
Q: prove the formula: X = -b+-(b^2-4ac)1/2 /2a by quadratic formula: in ax^2 + bx + c = 0 1/2=root A: There are several ways to prove the quadratic method. Here is the "completing the square" version. ...
Application problems	9/8/2005
Q: 1.A $5000 investment at an annual simple interest rate of 5.2% earned as much interest after one ... A: First let's find out how much interest was earned on the $5000. Money invested x rate = interest ...
0.005 & (0.00)1/2	9/1/2005
Q: I want to thank you for the reply. If (0.00) = 0, so 0(1/3) = 0 then 0.003 = (0.00) = 0 = 03 = 0, ... A: Now I see what you are doing. I hadn't seen that format before. 0.00(1/2) simply means that the ...
Simplifying Complex Fractions	8/16/2005
Q: One method for simplifying a complex fraction is to multiply the terms by the least common ... A: Not writing the denominator is essentially just skipping a step. If you want to be complete, you ...
simplifying	8/3/2005
Q: Simplify: 3/5- sqrt 2 The / means that the 3 is ove the rest of the problem, Not just the 5. Thank ... A: To remove the square root from the denominator, you multiply the top and bottom by (5 + SQRT(2)). ...
Are these correct	8/2/2005
Q: Simplify by adding like terms 5-x+xy-3yx-2+2x 5-x+xy-3yx-2+2x 5-2-x+2x+xy 3+x-2xy ... A: You have to collect the terms and not skip any steps. I think the 1st and 3rd problem is fully ...
inequalities......	8/1/2005
Q: I really need to know how to solve a system of inequalities by graphing..such as... x+y>4 -3x+y<-1 ... A: For the first problem, you first solve for y. y > -x + 4 Now, draw the line y = -x+4. That is a ...
word problem	7/31/2005
Q: Im having trouble setting up the second sentence in my equation for this problem. a jar of 400 ... A: Let the number of pennies, nickels, and dimes be p, n, and d, respectively. From the first sentence ...
Is this correct	7/29/2005
Q: Simplify by adding like terms -p-5-3p-6-2p+7-ax+3xa=-4p+2ax-18 If not correct please explain what I ... A: There are three types of terms: constants such as -5, terms with p such as -3p, and terms with ax. ...
Is this correct	7/27/2005
Q: \|-x-a\|-a(-x) if a=-3 x=-4 7+3(-4) 10(-4)=-40 If its not correct please explain step by step Sorry ... A: I'm going to use ABS(x) for \|x\|. ABS(-(-4) - (-3)) - (-3)(-(-4)) ABS(4+3) - (-3*4) 7 + 3(4) Do all ...
equation of a line	7/26/2005
Q: my question says to find the equation of the line parallel to the graph of 4x+2y=8 and containing ... A: To find a parallel line you need a point (which is given) and a slope of the other line. Let's find ...
algebra	7/25/2005
Q: Every normal distribution can be represented by the bell curve. Is this true? A: That is true. The normal distribution, also called Gaussian distribution, is an extremely important ...
Slope of a line	7/24/2005
Q: Determine the slope of the line that passes through (-8,7) and (5,-2). Thank you so so much for the ... A: The equation for the slope of a line is m = (y2 - y1)/(x2 - x1) We are given two points, Point 1 ...
vertex	7/21/2005
Q: find the vertex of this parabola: x= 3y^2 + 19 thanks Bobby A: To find the vertex of a parabola, you need to get the equation into the form below. Then, (x0,y0) ...
algebra	7/19/2005
Q: I am having some problems with algebra. Hope you can help. Find the inverse of: f(x)=-2x+7 ... A: To get the inverse of an equation, simply switch the x and y and solve for y. f(x) = -2x + 7 y = ...
word problems	7/18/2005
Q: The sum of three consecutive even numbers is 36. Find the numbers. When a number is added to four ... A: The sum of three consecutive even numbers is 36. Find the numbers. Let the first number be n. ...
Division	7/17/2005
Q: I read in a textbook the following: "Divide 4 by 11, correct to the nearest thousandth." Answer: ... A: The term correct is synonymous with the word "round." When you want to express a number, you may ...
math	7/16/2005
Q: 1. in the harrison school planning district the 989 children in grade 7& 8 represent 4.6% of the ... A: When you do math operations on percentages, you have to move the decimal point over to the left two ...
word problem help	7/15/2005
Q: A projectile is launched straight up with an initial velocity of 112 feet per second. How long would ... A: Using the given information, the initial velocity Vo is 112 ft/sec, we will assume that the initial ...
Solve For X	7/12/2005
Q: One method used to solve the following equation is to multiply both sides of the equation by the ... A: The method you used to solve the equation is incorrect. It is just a coincidence that you get the ...
applications of linear equations	7/10/2005
Q: If 2 is subtracted from a number and this difference is tripled, the result is 6 more than the ... A: Let the "number" be x. if 2 is subtracted from x and the difference (answer) is tripled (multiplied ...
Find the value(s) that makes...	7/9/2005
Q: Find the value(s) that makes the expression y^2-16 over y^2+16 undefined. A: This expression becomes undefined when there denominator (bottom) equals zero, because you cannot ...
The ideal surface area of...	7/7/2005
Q: The ideal surface area of a rubber ball shipped from the factory is 50.25 square inches. The company ... A: Since the ideal surface area is 50.25 square inches and the balls shipped can't vary by more than ...
If 2-3x>-1 and x+5>0, then...	7/6/2005
Q: If 2-3x>-1 and x+5>0, then x could equal each of the following except -4, -2, 0, or -5. Which one ... A: Let's solve the two inequalities first.. 2 - 3x > -1 subtract 2 from both sides -3x > -3 divide ...
Complimentary angles	7/5/2005
Q: 1.Two complimentary angles are such that one is 10 degress less than 3 times the other.Find the ... A: 1) let one angle be "a" and the other be "b". We know from the definition of complementary angles ...
thermometry	7/4/2005
Q: at what temperature have the centigrade and fahrenheit readings the samenumerical value? please ... A: The formula for converting centigrade from fahrenheit is Tf = (9/5)*Tc+32 If Tf = Tc, then we can ...
using cramer's rule...	7/2/2005
Q: What does 'z' equal? -5x + y - 4z = 1 5x - 3y + 6x = -2 -15x + 4y - 2z = 9 I know how to put this ... A: Matrices are hard to show with this text editor so I found a website that has a good example of ...
On beyond quadratic	6/29/2005
Q: I have one student who is extremely bright and always asks the most intriguing questions. When I was ... A: There are formula's for solving higher order equations such as cubics and quartics, but they are ...
word problem equation	6/27/2005
Q: Tom and Cathy decide to run a race. Tom can run at 10 meters per second and Cathy can run at 6 ... A: Let Tom start at 0 meters. Then, the distance he has traveled as a function of time is d = 10t ...
4 + 6(3-x) > 4(x+7...	6/25/2005
Q: 4 + 6(3-x) > 4(x+7) A: 4 + 6(3-x) > 4(x+7) distribute the 6 and the 4 through the parentheses. 6 + 18 - 6x > 4x + 28 24 - ...
Calculus	6/17/2005
Q: I'm not sure how to set this up. I think that if I had a good example, I could follow it, but I ... A: To get the equation for a line, you need a slope and a point. We are already given the point ...
quadratic equations	6/12/2005
Q: 3x^2 - 3x = x solve for the roots of each equation. show check A: Here's how to solve this problem 3x^2 - 3x = x subtract x from both sides 3x^2 - 4x = 0 factor out ...
ALGEBRA	6/9/2005
Q: FIND EQUATION OF THE LINE PASSING THRU (-12,10) AND PARALLEL TO THE LINE DETERMINED BY 10X+12Y=120 A: To find the equation of a line, we need a point and a slope. We are given that the line must pass ...
WORD PROBLEM	6/8/2005
Q: DRIVING DOWN A MOUNTAIN TOM FINDS THAT HE HAS DESCENDED 1800 FT IN ELEVATION BY THE TIME HE IS 3.25 ... A: The slope is represented a the vertical change divided by the horizontal change. We are given that ...
factoring trinomials	6/6/2005
Q: 6x squared + 14x + 4 A: With these types of problems, I usually use some trial and error, along with some experience. Let's ...
rational expressions simplifying	6/2/2005
Q: 3x - 9 * x^2 - 2x - 8 ________________________________ x + 5 * x^2 - x - 6 A: First we need to factor the terms so that we can cancel the ones that are on the top and bottom. ...
Quadratic Equations	6/1/2005
Q: Could you please tell me the best way to go about solving Quadratic Equations, I am currently very ... A: Since it is difficult for me to write square root symbols using only this simple text editor, I will ...
ALGEBRA WORD PROBLEM	5/22/2005
Q: I AM STUCK ON HOW TO MAKE AN EQUATION FROM THIS WORD PROBLEM PLS HELP. PROBLEM: TWO TRAINS ARE 330 ... A: We need to set up two equations from the information given. First, we are told that their speeds ...
How Do I Solve This?	5/21/2005
Q: I'm a photographer working with lenses. I'm working out the camera to lens and lens to object ... A: So far, you are on the right track. You need to get a common denominator so you can combine the ...
ALGEBRA	5/20/2005
Q: SOLVE AND CHECK SOLVE AND CHECK 12X-6=11X 5X+8+3X - X+5 =6X - 3 SOLVE FOR X AND CHECK -3X=27 ... A: On these problems, we want to manipulate the equation until it looks like x = something. Remember, ...
ALGEBRA	5/19/2005
Q: ... TWO POSITIVE NUMBERS HAVE A DIFFERENCE OF TWO AND THIER RECIPROCALS HAVE A DIFFERENCE OF ... A: Here are the two equations that we create from the information given in the problem: x - y = 2 ...
algebra / intermediate	5/18/2005
Q: two numbers have a difference of 2 and thier reciprocals have a difference of 32/33 . what are the ... A: Here are the two equations that we create from the information given in the problem: x - y = 2 ...
Unit Conversions	5/17/2005
Q: I want to thank you for the reply. When converting pounds to ounces and ounces to pounds, do these ... A: I think what you are saying is correct. The purpose of finding how many ... in .... is so that we ...
Unit Conversions	5/15/2005
Q: Does the process of unit conversions involve using division or multiplication or both? It requires ... A: Actually, either can be used. Multiplication and division can be used interchangeably. For ...
limits	5/13/2005
Q: Can you please show me all the different ways to do the following problem: What is the limit of ... A: I don't think you need L'hopitals rule or derivatives. You only need L'hopitals rule when h would ...
radius	4/22/2005
Q: If the radius of a circle is trippled, what would happen to the area? please explain A: I'll try to explain. The area of a circle is A = pi*r^2 Let's call the original circle C1, then the ...
Algerbra 2	4/21/2005
Q: i several problems i can not find the answer to . Would you be able to help me through a whole ... A: I won't be able to help you with your entire homework assignment. Here is what I suggest. First, ...
algebra question	4/20/2005
Q: the square root of 50y8 over the square root of 72y3? A: SQRT((50y^8)/(72y^3)) = SQRT((552y^8)/(22233y^3) we can take the pairs of numbers inside ...
Even and odd functions of pre-calc	4/18/2005
Q: I have a homework assignment do tonight and I am a little confused about the function f(x)=3. Is it ... A: These "simple" functions can be the most confusing. However, you should apply the same test as ...
algebra 2	4/16/2005
Q: the sequence -12,-5,2,9,...,72 has 13 terms. evaluate the related series. either it is (A) 383 (B) ... A: each term in the series is 7 greater than the previous term, so the terms are: -12, -5, 2, 9, 16, ...
trig	4/12/2005
Q: Determine the amplitude and period of each function. Then graph one period of the function. ... A: It is difficult for me to help you with the graphing part of these questions since I only have this ...
inverse functions	4/9/2005
Q: f(x)= 1-3x is one-to-one find the formula for f-1(inverse) what is the domain of f-1 what is the ... A: To find the inverse, you simply interchange the x and y, and then solve for y. Here's how: y = 1 - ...
algebra...I think	4/7/2005
Q: My son is in the 4th grade. I think this problem is an algebra problem but I think a number is ... A: You need to set up two equations. Let the first ticket be x and the second be y. We know that the ...
word problems	3/27/2005
Q: Diophanturs passed 1/12 of this life in infancy and 1/6 more in youth. Then he married and spent 1/7 ... A: The Son's life (S) can be expressed in terms of the Diophantur's life (D) as s = (1/2)d D life can ...
limits	3/25/2005
Q: I have just purchased the book,Calculus for Dummies,and I found that by limits, it doesn't teach ... A: I can't remember off the top of my head the exact method to solve this problem. However, from ...
average	3/23/2005
Q: of three numbers the first is double the second,the second is double the third and the average of ... A: Here are the three equations. x = 2y y = 2z (x + y + z)/3 = 77 let's write the last equation in ...
unitary method	3/21/2005
Q: oranges cost Rs. 1,56 per doz.and bananas cost Rs. 4.32 per dozs.find the cost of 100 oranges and ... A: If oranges cost 1.56 for 12, then the cost for one orange is 1.56/12 = 0.13. If bananas cost 4.32 ...
trignometry	3/18/2005
Q: 1) find an angle (theta), 0 <= theta <= 2pi, such that the sum of the squares of the sine and cosine ... A: Writing the problem in equation form, where theta is x, we have: (sin x)^2 + (cos x)^2 = 2 * (sin ...
Algebra	3/11/2005
Q: could you help me with this question... Find the domain of the function: f(x) = ... A: To find the domain, we need to know what values of x the function will not have a value. We can see ...
Algebra	3/8/2005
Q: 2r-3n=13 8r+3n=7 A: 1. Add the two equations together 10r + 0n = 20 10r = 20 divide both sides by 10 r = 2 plug r=2 ...
ALGEBRA	3/7/2005
Q: X+Y=3) 3X+2Y=7) CAN YOU GIVE ME THE ANSWER PLEASE A: x + y = 3 3x + 2y = 7 solve the first equation for y by subtracting x from both sides y = 3 - x ...
Changing Formula Subject	3/1/2005
Q: I need help with changing the subject of this formula to L. T=2pi sqrt l/g I am a bit confused, ... A: Here are the steps. T = (2pi)SQRT(L/g) divide both sides by 2pi T/(2pi) = SQRT(L/g) square both ...
circuits	2/27/2005
Q: Ok I have got a circuit with three cells cell 1 has an emf of 6v and a internal ressistance of 2 ... A: I'm having a difficult time reading your question. Here is what I think. If you have other ...
Algebra Word Problem	2/26/2005
Q: Hey there Mr.Soltani!Pls. try to anwer my problem ASAP. Ok, this is the actual problem: Music A ... A: There are several ways to solve this problem. Here is one. The cost for A is CA = 30 + 8n , where ...
algebra	2/25/2005
Q: if i walked 75 paces in 10 minutes and my leg stride is 30 inches, how far did i go in meters and ... A: This problem is about unit conversion. If you walked 75 paces and each pace is 30 inches, then you ...
Linear Systems	2/24/2005
Q: Marvin had $900 to invest last year. He put some $$$ in a guaranteed 10% interest account. He put ... A: I'll help you set up the equations. Let the amount invested in the guaranteed account be x and the ...
Algebra	2/21/2005
Q: Dylan drove to the beach, which is one hundred thirty-six kilometers away, at forty-eight kph. He ... A: Drive time can be calculated by dividing the number of miles driven by the speed. For instance if ...
Indices	2/20/2005
Q: I am not really sure how to do indices and whether should I ask this question under algebra, but I ... A: For these problems, you need to recognize the following: 6^x = (23)^x = 2^x 3^x So, for part a: ...
geometric series	2/15/2005
Q: just wanted to inquire on how you would solve the problem below: Find the sum of the geometric ... A: When we have a geometric series of the form: nth term = ar^n-1 the sum is S = a/(1-r) In our ...
solving quadratic equations	2/14/2005
Q: solve the given quadratic equations by factoring P^2-6P-27=0 A: We want the final form to look like this: (p + a)(p + b) = 0 if we multiply this out, we get p^2 + ...
Trigonometry Word Problems	2/13/2005
Q: Can you assist me with resolving the following problems: I need to see how it's done. I know the ... A: The equation we want to use is s = r*t, where s is the arc length, r is the radius of the circle, ...
College Algebra	2/9/2005
Q: A plane is flying a distance of 1000 miles round trip. On the return trip the plane has to fight a ... A: let x equal the speed on the first half of the flight. Then, x-50 would be the speed for the second ...
help	2/7/2005
Q: dividing exponetns. and scientific notation thank you soo much gaby A: I'm not sure what part of those you are having trouble with. However, here are some tips for each. ...
circuits	2/6/2005
Q: A circuit was set up to investigate the current through a 15 ohm resistor with applied pd .a 6 volt ... A: I'm having a little trouble understanding exactly what you are trying to describe. If you have a 6V ...
given g(x)=4/x +9/(x+2) find...	2/4/2005
Q: given g(x)=4/x +9/(x+2) find all x that satisfy g(x)=-2 A: g(x) = -2 = 4/x + 9/(x+2) we need to get a common denominator so we will multiply the first term by ...
solve for u u^2=-14+10u...	2/2/2005
Q: solve for u u^2=-14+10u A: u^2 = -14 + 10u subtract (-14 + 10u) from both sides u^2 - 10u + 14 = 0 Quadradic equation (-b ...
Algebra Question	1/28/2005
Q: I am trying to solve this problem using the Quadratic Equation.... 3h2 (2 is squared) + 12h -135 ... A: The quadratic equation is: (-b +/- SQRT(b^2 - 4ac))/(2a) where a is the coefficient of the squared ...
y-intercept form	1/26/2005
Q: Ok i have this test tomorrow so i really need your help and fast! Please. Ok i want to know how to ... A: Here is how to get the equation for line from the two points (-2,4) and (-6,5) The equation for a ...
Imaginary numbers	1/25/2005
Q: Soltani- I am a senior in secondary school in my second semester of algebra 2. I am having a ... A: Imaginary numbers are not really imaginary. They are used to represent things that can not be ...
Equasion	1/24/2005
Q: The average distance between the sun and the planet Neptune is 4.5 x 10^9 km. About how far does ... A: I think the question must ask, "how far does NEPTUNE travel in orbit around the sun" since we are ...
Cot, Csc, Sec	1/23/2005
Q: I need to check something. When i click cos^-1 on my computer is that giving me the value for Sec, ... A: On a calculator, cos^-1 usually represents arccos. So, if you have something like cos(x) = 1/2 ...
a GRE question	1/17/2005
Q: Please help me to solve the GRE question! 3X = 4y XY is not equal to 0 Which is greater, Colum A ... A: The ratio of X to Y can be expressed as X/Y and the ratio of Y to X can be expressed as Y/X. Let's ...
Systems of Linear Equations and Inequalities	1/16/2005
Q: hope you can answer my problem ASAP--before Tuesday morning or tomorrow because Im reviewing for my ... A: The equations represent the left and right hand side of the equality in the first equation. By ...
systems of equations	1/15/2005
Q: solve the following systems of equations 2x + 3y = 11 x - 4y = 0 possible answers 1. x,y = -1,4 2. ... A: 2x+3y=11 x-4y=0 multiply the second equation by -2 so the x terms will cancel when we add the two ...
systems of linear equations in two variables	1/15/2005
Q: solve the following systems of equations 2x = 4y - 5 6y = 3x + 3 Possible answers 1. (x,y) = ... A: If you put both of these equations into y = mx+b form, you will see that they are parallel (i.e. ...
evaluating and graphing sine and cosine	1/15/2005
Q: these are physics type problems that are related to sine and cosine. *use this info to solve ... A: a) latitude 45 degrees 45 degrees is halfway from the equator to the North Pole, so Bangor is 3963/2 ...
transformations	1/14/2005
Q: What is the equation of y=x^2 + 4 after: (a)a dilation of 2 (b)a rotation of 180 degrees (c)a ... A: To answer this question, you should know the standard form of a parabola is y=a(x-h)2+k 1. a ...
Algebra	1/13/2005
Q: Todd purchases all of his CDs in a local store. All CDs in this store cost $13.99. Todd's sister ... A: First we will set up the equation for Todd. The cost of the CDs(y) is equal to 13.99 times the ...
equations?!!!!!!!!	1/13/2005
Q: ok i need help and maybe the answers to these problems lol :) which ever one you will go with lol ok ... A: I'll go through the steps of a couple of the problems to help you understand the process. 2. ...
Algebra	1/12/2005
Q: I am trying to help my nephew with his math, but I forgot some of the steps to solving the ... A: You were on the right track. Another way to say "take the 4 and make it negative which changes the ...
Factoring	1/11/2005
Q: i cant figure out how to factor 12a^3-27ab^4. I just started as a college freshman today and im ... A: You can facter a 3a out of each term and write it as 3a(4a^2 - 9b^4) Then, the terms in the ...
alg	1/10/2005
Q: how would u solve 0.5=3^2a-1 A: Here is how I would solve it. 0.5 = 3^(2a) - 1 add 1 to both sides 1.5 = 3^(2a) ln of both sides ln ...
algebra	1/10/2005
Q: I cannot remember how to solve. The width of a rectangular lot is 45 ft. shorter than the length. If ... A: First we need to turn the given information into two equations. Then we can solve them. First, we ...
algebra 1	1/9/2005
Q: how would i write an equation of a line with a slope of 0 A: The equation for a line is y = mx + b, where m is the slope and b is the y-intercept. If m is 0, ...
verbal question	1/9/2005
Q: The profit a coat manufacturer makes each day is modeled by the equation P(x)=-x^2+120x-2000, where ... A: The profit in this case is like the y variable when you normally graph a curve. The question wants ...
trig	1/9/2005
Q: The tide at a boat dock can be modeled by the equation y=-2cos(pi/6t)+8, where t is the number of ... A: You were pretty close to getting the answer. You must recognize that cox (x degrees) = 1/2 when the ...
parabolas	1/6/2005
Q: Followup To Question -Hi Bobby could you please answer this question Thanks. I'm studying algebra ... A: You can use any x you choose and get a corresponding y value. For instance, if you want to graph ...
parabolas	1/5/2005
Q: Followup To Question - Hi Bobby could you please answer this question Thanks. I'm studying algebra ... A: I'm sorry. I'm not really sure what you asking. Go to this website where you can see what the ...
parabolas	1/5/2005
Q: I'm studying algebra on my own so I dont have a teacher to help me. Graph the parabolas in the same ... A: For any x value, you can plug it into the equation to get y. For instance, x = -3, then y = (-3)^2 ...
The addition or subtraction method	1/4/2005
Q: I still dont under stand the one problem i had and i could really use your help if you could please ... A: We want to manipulate one of the equations so that one of the variables will drop out when we add ...
parabolas	1/4/2005
Q: I'm studying algebra on my own so I dont have a teacher to help me. Graph the parabolas in the same ... A: I can't really help with the graph because I only have access to this text box. To graph these ...
Ball falling + bouncing	1/3/2005
Q: What website? Thank you, this helped a lot. I just want to clarify - 48 * (1 + 13/15) = x D = x / ... A: Sorry, I forgot to paste the link. Here is the website. ...
Ball falling + bouncing	1/3/2005
Q: When a bouncy ball is dropped from 48" and rebounds 13/15 of its vertical distance each time, what ... A: Please see the following website for an explanation. It involves an infinite summation that reduces ...
function. help please.	1/1/2005
Q: Let f be the function given by f(x)=3x^4+x^3-21x^2. a.) write an equation of the line tangent to ... A: There are a lot of steps to this problem so I will give you some tips on solving each part: 1. to ...
The addition or subtraction method	12/30/2004
Q: I have a couple problems that i could really use some help with. You have to solve these two ... A: To use the addition or subtraction method, you want one of the variables to cancel. For the first ...
Graphing equations	12/28/2004
Q: Solve the system by graphing 2x+y=1 x=2y+8 The formula that is supposed to be used is mx+b=y but, ... A: To get the equations into the form above, you must solve each one for y. Here's how: 2x+y=1 ...
Graphs	12/27/2004
Q: 9. An investment company charged $695 a month to rent a 2-bedroom townhouse in 1999. In 2002, the ... A: The first point would be x = 1999 and y = 695. The second point would be x = 2002 and y = 715. The ...
find the mid point of a line segment	12/25/2004
Q: Find the midpoint of a line segment whose points are given. (9/5 - 2/5) and ... A: To find the midpoint of a line section the formula is: x = (x1 + x2)/2 and y = (y1 + y2)/2 ...
equation of a line	12/24/2004
Q: Find the equation of the line. Slope -2, passes through (1,1) A: To find the equation of a line, the formula is: y - y1 = m(x-x1) where m is the slope and (x1,y1) ...
mid point of line segment	12/24/2004
Q: Find the mid point of a line segment whose end points are given. (7,3) and (10,6) A: To find the midpoint of a line section the formula is: x = (x1 + x2)/2 and y = (y1 + y2)/2 where ...
log equations	12/24/2004
Q: If log(x+1) 64=2, find x. (The (x+1) is small and is the base of the log.) I used the change of ... A: Here are the steps from where you left off: (log 64)/(log(x+1) = 2 log 64 = log(2^6) = 6*log(2) ...
Fractions & Division	12/21/2004
Q: Why does a fraction represent or indicate division? Example: 2/5 = 2 divided by 5 I know that ... A: A fraction is the number of parts (numerator) of the whole (denominator). For instance if you have ...
algebra- two unknowns	12/17/2004
Q: ..i received an adjustment check today for $ 270,744.79. it consists of two components: X days ... A: To solve this, you really need one more equation. For instance if you knew the total number of ...
Algebra	12/15/2004
Q: 3xy^5/x^2y^3 * y^2/6x A: When you do problems like these, you can cancel the variables on the denominator with the ones on ...
Object falling	12/12/2004
Q: How far (in feet) will an object fall in 5 seconds? A: The equation for the distance an object falls is: d = (1/2)gt^2 d = distance g = acceleration due ...
Word Problems: Algebra 2/Trig.	12/10/2004
Q: How many kilograms of water must be evaporated from 12 kg of a 5% salt solution to produce a ... A: If we assume that percent is based on weight, then in 12 kg, there is 12kg*0.05 = 0.6 kg of salt and ...
problem	12/8/2004
Q: what is 5+(210)-5/2= thank you, me and this friend are going back and forth on it and need a third ... A: Here is a third, and hopefully final, opinion. 5 + (210) - 5/2 = multiply 2*10 to get 20 5 + 20 ...
Algebra 1	12/6/2004
Q: I am trying to help my granddaughter with her Algebra - it's been a long time for me. The question ... A: I would be glad to help. These problems are known as "two equation, two unknowns" problems. That ...
algebra	11/30/2004
Q: the area of a circle is not known. when the radius of the old circle is increased by 3, the area of ... A: Let's call the first circle, circle 1 and the second circle circle 2. The area for the first circle ...
Algebra question	11/25/2004
Q: I am having a little trouble with this problem... maybe you can help me? part a) Solve the ... A: This is a difficult problem. Your answer to part a is correct. The answer to part b is (x < -3). ...
Work algebra	11/11/2004
Q: I am Eva from Belgium. I'm following my last year at secondary school. For math we have to make a ... A: There are several jobs that use algebra in their daily use. Here are some examples: computer ...
Need help with this problem. Find...	11/7/2004
Q: Need help with this problem. Find LCD for these expressions and convert each into an eqivalent ... A: The way I would approach this problem is to multiply the first term by the denominator of the second ...
Algebra	11/6/2004
Q: 1) x - 3y + 2x + 5y = 2) 5p +t -7p +4t = 3) 3c +5d -c +4c +d+d = 4)3a -6a-b -5b +4a +b= A: When you do these problems, you can add or subtract the terms that have the same variable. For ...
absolute value	11/5/2004
Q: Trying to help my kid with a math problem: 40-[x]<[40-x] x=? A: The answer is x<0 and x>40. The best way to figure this one out is to graph it. It is hard for me ...
algebra	11/3/2004
Q: how do u do " using proportions to find a percent " I NEED HELP@@ 40% of x is 28. What is x? ... A: When you solve these problems, there are a couple of things you need to know. First of all, 40% is ...
algebra	10/27/2004
Q: Please help me,I can't do this word problem,If 6 is subtracted from three times the square of a ... A: Putting the words into numbers, If 6 is subtracted from three times the square of a positive number ...
algebra	10/26/2004
Q: Can you help me solve and graph the following: x>1 or x+2<1 A: The first one is just x>1. If you subtract 2 from both sides of the second one, you get x < -1. On ...
finding the value of office copiers in 1970	10/25/2004
Q: United States production of photographic equipment and supplies in 1971 Total: $3,980 million (This ... A: The equation looks like this: C2 = C1 + 0.30*C1 C2 is the cost of copiers in 1971 and C1 is the ...
The quadratic formula	10/23/2004
Q: I need your help on this problem you have to use the quadratic formula to solve the following step ... A: The quadratic formula is: (-b +- SQRT(b^2 - 4ac))/(2a) where a,b, and c are of the form ax^2 + bx ...
algebra I exam question	10/21/2004
Q: 7/8 of the tickets had been sold and there were 560 tickets left. How many tickets are printed? ... A: Since 7/8 of the tickets have been sold, that means that 1/8 of the tickets is equal to 560. When ...
How you answer this?	10/19/2004
Q: A homeowner is installinga fence around the garden at the right. The gardenn has a perimeter of 220 ... A: I hope I understand your question. You say that you have a rectangle with sides of length 3x, 3x, ...
Pecalculus	10/15/2004
Q: The book gives an answer but does not explain step-by-step how the answer was attained. Can you ... A: To find a maximum for this equation, you take the derivative of P(t) and set it equal to zero(Since ...
ratio	10/14/2004
Q: How do I go about finding the number of women on a committee? Thanks in advance. harraineIf the ... A: In this problem, we create two equations and two unknowns. When we do that, we can solve them. ...
multistep algebra	10/11/2004
Q: find the answer for the varible 2z - 5(z+2)= -8 - 2z A: Here are the steps to solve this problem. You want to manipulate the equation until it looks like z ...
pre-algebra	10/10/2004
Q: The first four figures in a pattern contain 2,6,12 and 20 dots. How many dots will the fifth figure ... A: To find the pattern, see how much of a change there was between each number. 2 and 6. There was a ...
algebra 1	10/8/2004
Q: Tickets to a local movie were sold at $5.00 for adults and $3.50 for students. If 260 tickets were ... A: These problems are known as "two equations, two unknowns" problems. Here's how you solve them. 1. ...
algebra	10/7/2004
Q: Question is- Kim's Karate school started this year with 38 students. By the end of the year, the ... A: To find the percentage growth you take, ((new - old)/old) x 100 (83 - 38)/38 x 100 = 118 % to ...
Algebra	10/4/2004
Q: 1. I need to graph f(x)= x+5/x+4 Can you give me some of those points on both lines. 2. I need ... A: 1. f(x) = (x+5)/(x+4) x=0 f(x) = 5/4 x=1 f(x) = 6/5 x=2 f(x) = 7/6 x=3 f(x) = 8/7 etc... 2. f(x) = ...
Translating symbols	9/30/2004
Q: I'm having problems with these questions on my homework and im only in 5th grade and i dont ... A: For these problems you just write them as you would read them but you use the following symbols: = ...
Algebra problem	9/29/2004
Q: do the equaions x+2.4=1.5 and x + 24 = 15 have the same solution? exlplan A: I saw your review. I responded to your question on the same day you asked it, Sept. 29. I don't ...
word problem	9/27/2004
Q: I need your help to solve the following word proble. Here is the question... "The decorating ... A: I'd be glad to help. Since you want cuts every 1/16 of an inch and you have three inches, that ...
find a value for the constant...	9/25/2004
Q: find a value for the constant k so that f(x)=the set of (sin3x)/x, x does not = 0 ... A: There are a couple of ways to solve this one. If you are in algebra, the easiest way is to graph it ...
Answer	9/24/2004
Q: I'm trying to get the answer to: y = 80x + 5000 A: The formula you gave me is an equation for a line. There is no answer unless you have an x or y. ...
basic algebra	9/22/2004
Q: my brother is in the 7th grade and called me with this problem: what is 1+2+3+4...+500 ? what is ... A: The answers are 125,250 62500, and 62750. Here's how you solve it quickly. For the first series, ...
Hello Bobby. I got this one...	9/21/2004
Q: I got this one wrong in my math test. Question On a trip, Marie drove 200 miles in 5 hours using ... A: 1. Marie's average speed for the trip in miles per hour. 200 miles / 5 hours = 40 miles / hour 2. ...
chemistry	9/19/2004
Q: How can you figure out what is good precision and accuracy? I asked my teacher and he explained to ... A: I'll take a shot at the answer. If you take 5 shots at a bullseye and all 5 shots fall within a few ...
a proportion question	9/17/2004
Q: Here is the question. A certain holiday is always on the fourth of Tuesday of month X. If month X ... A: The first Tuesday can occur on the 1,2,3,4,5,6,7 of the month. Note that it can't occur on the 8th ...
Measurements- Latitude and Longitude	9/16/2004
Q: On many maps the Latitude and Longitude lines are featured. How are these used to calculate X ... A: The answer to this is somewhat complex. The distance in longitude varies depending on how far your ...
Square footage	9/15/2004
Q: I need to figure out the square footage of a corner work surface. Here are the dimensions... 25" - ... A: I'm sorry but I can't tell what shape you are trying to describe. Here are some tips to help you. ...
alegbra	9/14/2004
Q: 1.find an algebraic solution to the following system of linear equations- x+2y=1 ... A: Sorry for the delay. I've been really busy lately. Here are the steps. Solve one of the equations ...
word problem	9/10/2004
Q: Can you please help me solve the question below? ClaraSam and Florence together have $100. After ... A: Let the amount of money Sam has be S and the amount of money Florence has be F. Let's turn the ...
9X - 3Y...	9/7/2004
Q: Here is the question that I need your help for... If 9X - 3Y = 12 and 3X - 5Y = 7, then 6X - 2Y ... A: For this equation, we have two equations and two unknowns (X and Y). Here's how we solve these. ...
quadractic equation	9/3/2004
Q: Solve the equation by any convenient method. 80+6x=9x2 (eighty plus six x equals 9x squared) A: 80+6x = 9x^2 9x^2 - 6x - 80 = 0 you can use the quadratic equation. (-b + SQRT(b^2-4ac))/(2a) and ...
algebra	9/2/2004
Q: can you solve this equation? 3 + 7 = 9 ---------- I tried to write the fraction best x 1 2x ... A: I hope this is what you mean. (3/x) + (7/12x) = 9 you want the denominator (the bottom) of both ...
word problem	8/29/2004
Q: I wanted to confirm if my answer to the following word problem question is correct with you since ... A: Your answer is correct. You can check it by plugging in some numbers. Say the cost for a week is c ...
word problem	8/26/2004
Q: A week ago the sun set at 6:55 PM. Each day for the next five days the sun sets x minutes earlier. ... A: Your answer is correct if you count the day after the day that the sun set at 6:55 to be the first ...
algebra	8/21/2004
Q: I have two questions for you: 1. If 2/3 log 8 + 1/2 log B = 1 - 3 log A. (In this equation in the ... A: 1. Remember that loga b = (logc b)/(logc a) We will use this property where c = 10. So log5 8 = ...
algebra	8/19/2004
Q: Solve for a. 15a= 11(11a-[5a+(12a-5)]+14) A: Here's how to solve this problem, 15a= 11(11a-[5a+(12a-5)]+14) start at the inner parenthesis on ...
solving equation using substitution, addition method, or multiplication over addition method	8/17/2004
Q: Please solve and show your work. I can't get answers that work when I plug them back into the ... A: 5x-y=2 x+2y=1 solve the first equation for y. -y = 2-5x y = 5x-2 substitute this y into the ...
Floor function	8/16/2004
Q: I was looking at a solution to a problem and saw the following result: [2x] = [x] + [x + 1/2] Where ... A: It is hard for me to describe the floor function without pictures so I found a website for you to ...
x-3y+z=-10 3x+2y-z=-11 2x-4y-2z=-4...	8/16/2004
Q: x-3y+z=-10 3x+2y-z=-11 2x-4y-2z=-46 A: There is an easy way to solve three equations with three unknowns using matrices. But, I will ...
trigonometry	8/14/2004
Q: how do i factor the following: x^4+2x^3-x-2 and 343x^3 +y^9 A: 1. x^4 + 2x^3 - x - 2 After factoring, it should look something like this where a,b,c,d,e are ...
Algebra/Chemistry Problem	8/13/2004
Q: I need to figure out how many litres I use to mix a 16 milimoles of a certain substance for a ... A: If you have 16 millimoles of a substance and you want to make a solution that is 16 ...
set problem	8/12/2004
Q: I'd really appreciate if you could explain your approach to solve this question. My problem is that ... A: This one is hard to describe in an email. It is so much easier to draw a picture. If you can draw ...
distance problem	8/11/2004
Q: I'm very sorry, but I copied the question wrong. Billy's average rate is 50 mph, not 200 mph. I ... A: Small error in your math. It should be 300 instead of -300 below because a negative times a ...
distance problem	8/11/2004
Q: But the answer is 7:30pm. How so?Hi Bobby and thank you for your reply. So, t is the time the second ... A: I'm not sure how the answer could be 7:30. Here is the problem. **At 5 p.m., Jill leaves New York ...
SQUARE ROOT METHOD	8/11/2004
Q: How are you doing today? Hope all is well. This square root method thing is driving me crazy. I ... A: I'd be glad to help. 1. x^2 - 16 = 0 we want to sovle for x so we will try to manipulate the ...
A MAN DRIVES X MILES THE FIRST...	8/10/2004
Q: A MAN DRIVES X MILES THE FIRST DAY, Y MILES THE SECOND DAY, AND Z MILES THE THIRD DAY AVERAGE ... A: To get the average miles driven per day, you take the sum of all the miles driven divided by the ...
distance problem	8/10/2004
Q: So, t is the time the second plane overtakes the first one and not the time (or hours) that took for ... A: Here is the way I solve this one. You have to set a single reference. Say that jill starts at a ...
distance problem	8/10/2004
Q: will you please take me through the steps to solve the following question? An airplane leaves ... A: Here is how we solve this problem. We first want to set up equations that represent the distance ...
investments	8/9/2004
Q: The annual return on two investments totals $464. One investment gives 8% interest and the other ... A: This problem involves two equations and two unknowns. Let's say that the amount invested at 8% is x ...
Inequalities	8/6/2004
Q: can you help me solve this problem? (1/x)-x>0 A: Here's how you solve this. (1/x) - x > 0 add x to both sides. (1/x) > x multiply both sides by x 1 ...
word problem	8/5/2004
Q: The face value, f dollars, of a collection of dimes and nickels is given by the equation ... A: The formula given can be stated as the face value in dollars of a combination of nickels and dimes ...
math	8/5/2004
Q: On a standardized test with a normal distribution and a standard deviation of 2, a score of 35 will ... A: Ab, Please read the following paragraph carefully before I explain this problem. One useful ...
logarithms/smogarithms	8/5/2004
Q: 4 questions have i 1) Evaluate the expression; 2 (upper log)( lower 2) (upper 7) 2)Write the ... A: 1. 2^(log2 7) For this problem, we use a property of logarithms that states: x^(logx y)= y Here ...
performing indicated operations	8/5/2004
Q: Bobby can you help me in "performing indicated operations" on this problem? This is what the ... A: The first step you want to do is to get a common denominator for each fraction. Then we can ...
factoring	8/5/2004
Q: Bobby, I need help factoring this problem. Can you help me? x^2-y^2+4x+6y-5 A: The answer is (x+y-1)(x-y+5). The easiest way I can tell you to do is trial and error. Since you ...
math	8/4/2004
Q: Why when I graph the inverse of y=2x^2(restricted from 0 to 2) on a graphing calculator don't I get ... A: When you try to graph the inverse of y=2x^2, the calculator will not graph it because it is not a ...
algebra	8/4/2004
Q: What a trick! It does save a lot of time. Thank you very much. I have another word problem (Motion ... A: On a trip of 408 miles, Dennis travels the first 160 miles in 4 hours. At what rate must he travel ...
math	8/4/2004
Q: If it's not that much trouble, can you please explain all the steps? (especially why did you need ... A: I used the C1, C2, r1, r2, A1, A2, to indicate the Circumference, radius, and areas of the first ...
math	8/4/2004
Q: The circumference of a circular plot of land is increased by 10%. What is the best estimate of the ... A: A = pir^2 C = 2pir For this problem, the new circumference, C2 = 1.1C1. This is the same as ...
algebra	8/4/2004
Q: Here's the question from GRE: ***There are 20 rows of seats in an auditorium. If the first row has ... A: Fortunately, there are some formulas you can use for this problem. We want to add up a bunch of ...
WORD PROBLEM	8/4/2004
Q: How are you doing today? Hope all is well. I have this word problem that I can't figure out. I ... A: For this problem, try to imagine the ladder forming a triangle with the wall and the ground. The ...
word problems	8/3/2004
Q: A cup of coffee is taken out of the microwave oven and placed in a room. The temperature T in ... A: That is a lot of questions. Do you want me to quit my job? Just kidding. I'll try and help with ...
math	8/3/2004
Q: I misprinted, the answer,80.5 is correct according to my book.I accidentally typed in a answer for a ... A: I tried to draw the what the curve would look like. It's really hard to draw without a pencil. It ...
math	8/3/2004
Q: In a normal distribution, if the mean+2standard deviation=60, and mean+2standard deviation=40, ... A: I think the question should read like this: In a normal distribution, if the mean+2*standard ...
math	8/3/2004
Q: The mean is 82.75 and the standard deviation is 2.25. If the scores were normally distributed, which ... A: I think the answer you have received is incorrect. If the scores were normally distributed, then ...
how to solve	8/3/2004
Q: if y=ab divided by a+b , then b equals ? or y= ab __ a+b then b equals A: Here are the steps you can use to solve for b. Remember that if you do something to one side, you ...
word problem	8/2/2004
Q: Find the interest earned for an investment of $5000 for 10 years at an interest rate of 6.5% if the ... A: For this problem, we will use two formulas. The first one for parts a, b, and c is FV = P(1 + ...
Word problems	8/2/2004
Q: I can solve equations when they are given to me in a math format but I don't know how to set up an ... A: These problems can be tricky to set up. They get easier with practice. We need to see what is ...
Proportions	8/2/2004
Q: If a proportion such as a/b = c/d has eight different proportion calculations, how many different ... A: I think there would be 24 for three ratios and and 48 for 4 ratios. I think the pattern is 8 time ...
algebra : factoring expressions	8/2/2004
Q: factor the expression x^2-9 A: (x^2-9) There are several properties you can use to help you factor expressions. You can usually ...
algebra	8/2/2004
Q: Can you add these fractions for me? x^3 + y^2 _____________ x^2-xy+y^2 x^2-xy+y^2 A: I am not sure what you are trying to write. Could you write them differently so that I could ...
EQUATIONS WITH RATIONAL EXPRESSIONS	8/2/2004
Q: These two problems were giving me trouble. I was wondering if you can help me. Thanks. 1. w/6 = ... A: 1. The first one is a little tricky. w/6 = 3w/11 divide both sides by w and multiply both sides by ...
Lines	7/31/2004
Q: 1)How can you change the equation : y-3=(-5/6)(x-2) to y-3=(-5/6)x+(5/3) ? 2)How ... A: 1) x(y + z) = xy + xz. Example 1: 5 (3 + 2) = 53 + 52 = 15 + 10 = 25 Example 2: 6 (x - 3) = 6*x ...
algebra	7/31/2004
Q: The cost C in dollars to build a new home can be approximated using the equation C=67x + 5000, where ... A: When we want to solve problems like this we want to use the equation that we are given and try to ...
Lines	7/29/2004
Q: The equation : L=5x+6y=9 a) Find the equation of the line parallel L through the point (2,3) b) ... A: In order to find the equation for a line, we need a point on the line and the slope. For part a and ...
factoring	7/28/2004
Q: im in the 9th grade, soon to be 10th, im taking my SOL for virginia tomorrow because i had failed it ... A: First, I'll try to explain what FOIL is. It stands for First, Outer, Inner, Last. It is used to ...
algebra	7/28/2004
Q: How would you write x^4+12x^2+27 and x^3-x^2-2 as a product of linear factors and quadratic factors ... A: For the first problem, I use a simple method that uses some guessing with certain rules. The ...

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