| Subject | Date Asked |
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| MATHEMATIC | 7/20/2009 |
Q: WHAT ARE THE ADVANTAGES OF USING CRAMERS RULE
A: The Cramers rule is that it can be done with essentially no thought at all. It is perfect for things ...
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| partial differentiation | 7/14/2009 |
Q: If ycosx= e( to the power x), show that d2y/dx2 - 2 tan dy/dx - 2y=0 i tried to work it out and i ...
A: ycosx = e^x so use implicit differentiation to find dy/dx. So dy/dx*cosx - ysinx = e^x So dy/dx = ...
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| Trig | 7/2/2009 |
Q: I am trying to prove the following: sin(3x)=sin(x)(3cos^2(x)-sin^2(x)) Solving the RHS side I have ...
A: All of your steps are correct. However, for the final step you have to be a bit clever. ...
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| homework help!! | 6/22/2009 |
Q: State the exact value, in simple radical form : (NO DECIMALS !!) 6. sin 225° 7. tan 3π/4 ...
A: These questions come directly from the unit circle. They will all be much easier if you consult the ...
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| solid geometry | 6/16/2009 |
Q: The curved surface area of a cylinder is 24/7 times the total flat surface area(top+bottom).If the ...
A: Let the radius of the cylinder be r Let the height of the cylinder be h So using our geometry ...
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| advanced math- demand equation | 6/13/2009 |
Q: Suppose that a market research company finds that at a price of p = $20, they would sell x = 42 ...
A: The first step with word problems is to get rid of the words. We do this by extracting all of the ...
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| Need to find coordinates of intesection on an ellipse wall whenl ine from the center intersects it. | 6/8/2009 |
Q: I am trying to write a VBA program that will find the coordinates of the intersection of a line that ...
A: I'm sorry for such an incredibly late answer. I had bunch of finals to take. Anyways, from what I ...
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| i can't get it out | 6/6/2009 |
Q: A curve has equation y= sinx/x x>0. All turning points of satisfy a) xsinx - cosx = 0 b)xcosx + sinx ...
A: Just solve for x in each of those equations. a. xsinx - cosx = 0 so xsinx = cosx so x = cotx. You ...
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| qubic feet formula | 4/26/2009 |
Q: how can we find the cubic feet of wooden box when the internal size of the box is known prefered a ...
A: First, I would need to know the width or thickness of the wood. Also, I need to know the dimensions ...
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| problem solving | 4/16/2009 |
Q: in AD 1054 chinese astronomers observed the light from a supernova in the night sky. This supernova ...
A: Well, light travels at one light year per year hence the name light year. So, in order for us to see ...
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| problem solving | 4/11/2009 |
Q: discuss how the continuity equation and bernoulli's equation might relate to one another?
A: This is a nice question, but it isn't exactly a math problem. The continuity equation is a partial ...
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| agent 007.5 | 4/9/2009 |
Q: A box-shaped building is 240 feet high, 54 feet wide along its north face and 46 feet deep along its ...
A: For this question, to find the shortest path, what you do is "unfold the building so that its four ...
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| Product of functions | 4/1/2009 |
Q: I am having trouble with this question, I wonder if you can help: Sketch the graphs of f and g on ...
A: Basically, use radians for sin(x). So the sin will reach its peak at x = pi/2 rather than 90 ...
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| calculus | 3/30/2009 |
Q: How do I find the x-intercepts for the following equation: g(x)=x^1/3 (x+3)^2/3? I need them in ...
A: Well, you have the equation x^(1/3)(x + 3)^(2/3) = 0 So either x^(1/3) = 0 OR (x + 2)^(2/3) = ...
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| evaluating functions by comparing rate of change | 3/29/2009 |
Q: I am trying to figure out what the question is asking for in the following: Evaluate the functions ...
A: Well, I would say that you are right overall, but you have a few problems. First, if the math ...
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| algebra | 3/26/2009 |
Q: I am studying for a test and am having trouble working a review question. the original problem is ...
A: Well, follow through my algebra and see if you understand each step. sqrt(2x + 7) = 1 + sqrt(x+3) ...
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| word problem | 3/22/2009 |
Q: 1. if the price of gasoline increase by 25% and Ron intends to spend only 15% more on gasoline, by ...
A: 1. Well, if the price goes up by 25%, Ron will have to pay 125/100 times as much as usual or rather ...
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| Quadratic Word Problems | 3/20/2009 |
Q: I'm having trouble with 2 questions: 1. A margin x inches wide is drawn on a book cover measuring 12 ...
A: I will set up the equations for both problems. As an exercise, you should solve those equations. So ...
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| advanced math | 3/19/2009 |
Q: To find the reciprocal of a positive number a, one must solve for x in: (1/x)=a or (1/x)-a=0. Create ...
A: Well, newtons method is basically Xn = X(n-1) - f(X(n-1))/ fprime(x(n-1)). So since the derivative ...
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| MATHS | 3/17/2009 |
Q: Can you please calculate the dot product of each of the following pairs of vectors, and also state ...
A: My apologies for such a late answer. As for your questions, I think that I will just do one general ...
|
| 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: I'm so sorry for taking so long. It has been quite a hectic week. Anyways, you will have to use the ...
|
| plane trigonometry | 3/15/2009 |
Q: solve the following oblique triangle: a=134.2, b=84.54, B= 52 degree 9' 11"
A: Well, to solve this problem, you will have to use the law of sines and the law of cosines. sinA = ...
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| please i`m in neeed of your help! | 3/12/2009 |
Q: I am really in need of your help. I don`t understand this question what so ever, and i think you may ...
A: I guess that I cannot then on this question since I'm not sure I understand what breaking even ...
|
| Mills & Decimal Rates | 3/10/2009 |
Q: I read the following in an old business mathematics textbook: "Express 13 mills as a decimal part of ...
A: 0.013 dollars as a decimal part of 1.00 is basically representing what fraction as a decimal it is. ...
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| problem solving that uses quadratic formula | 3/8/2009 |
Q: i have no problems with using the quadratic formula, but i just couldn't equate this problem ...
A: Well, suppose that the width of the border is x. Then, the dimensions of your mural will be (15 - ...
|
| question | 3/6/2009 |
Q: prove that (101)^50>(100)^50+(99)650
A: Well, you know that (101)^50 = (100 + 1)^50 = 100^50 + 50*100^49 +... + 1 by the binomial formula. ...
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| Probabilities | 3/4/2009 |
Q: list consists of p positive and n negative numbers. if a number is picked randomly,the probability ...
A: To solve this problem, a systematic approach is your best bet. You know there is a total of p + n ...
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| Math Problem | 2/22/2009 |
Q: I am a 6th grade student and cannot solve this math equation and would like your help. Thanks ...
A: Hey Matt, For this kind of question, there is no definite way of doing it. Sometimes you just see ...
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| Work | 2/19/2009 |
Q: A 144lb bag of sand is lifted at a constant rate. At 18ft half the sand is gone. How much work has ...
A: I'm assuming that sand is leaving the bag at a constant rate. So the amount of sand at a given ...
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| Percentages | 2/11/2009 |
Q: I saw this solution in an old mathematics book. I cannot understand how the solution to the answer ...
A: You are correct. The best way is to divide 16 by 4%. However, they are trying to explain how to do ...
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| trig identies | 2/2/2009 |
Q: a non right triangle: tan(a)+tan(b)+tan(c) =tan(a)tan(b)tan(c) I need guidance on proof. Not sure ...
A: tan(a) + tan(b) + tan(c) = tan(a)tan(b)tan(c) LHS= tan(a) + tan(b) - tan(a+b) since c+a+b=pi ...
|
| Limit | 1/31/2009 |
Q: show that the equation X + tan(X) = 1 has at least one solution in [0,π/4]
A: Well, let f(x) = X + tan(X) - 1. So solving for f(x)=0 will be the same thing as solving for X in ...
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| factoring exponetials | 1/22/2009 |
Q: my son was asked to factor x^4^m - y^4^n he has looked in his book and we have tried several ways to ...
A: x^4^m can be written as (x^a)^4 for some a. Take an example. let m = 3. Then x^64 = (x^16)^4. ...
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| intermediate algebra | 1/20/2009 |
Q: I have no idea on how to answer the following question. Please help. Select any imaginary ...
A: Well, let's just pick a complex number to start with. Let's pick 1+i since that is one of the more ...
|
| Pre-calculus help | 1/17/2009 |
Q: I do not understand how to solve: 2 cos^2 x = 13 sin x - 5 given that 0 </= x < 2pi. Thank you very ...
A: Well, I won't show you how to do the whole thing, but I will give you a nice hint. You know that ...
|
| systems of equations in three variables | 1/11/2009 |
Q: -9x-2+10z=72 -3x-5y+3z=-8 -5y=-5
A: I generally don't answer homework questions. If you could show me that you have made some effort on ...
|
| Trigonometry + radians? | 12/19/2008 |
Q: I've been puzzling over a section of problems for a while and can't figure it out. The instruction ...
A: Well, it seems to me that you may need to have a little extra help from your teacher after school. ...
|
| Implicit Differentiation of Trig Functions | 12/14/2008 |
Q: I need help implicitly differentiating cos(x+y) + sin (x-y) = 0 @ y' = (pi/4, -pi/4). There is ...
A: Well, first of the point (pi/4, -pi/4) is not on the curve cos(x+y) + sin(x-y) = 0. Did you mean to ...
|
| probability | 12/11/2008 |
Q: The directions say find the area of the indicated sector(s). Find the probabilty of spinning the ...
A: Well, you don't need to find the area of the sectors. You just know that the spinner has to land in ...
|
| Trig | 12/10/2008 |
Q: I was wondering if you could help me find the exact value of the six trigonometric functions for ...
A: Hey Steph, Well, the first thing you do is convert this to something that is between 0 and 360 ...
|
| Determine Interest Rates | 12/8/2008 |
Q: Can you determine the answers to the following question by using a simple calculation? An investor ...
A: Note that I am assuming the interest rates have to be integers. If they don't have to be integers, ...
|
| Math | 12/7/2008 |
Q: Proof that x(y+z)=xy+xz
A: Well, think of it like this. xy + xz is the same thing as y*x + z*x. Now when you do y*x, what you ...
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| Math Question. | 12/5/2008 |
Q: A woman earns 10% more than her husband. Together they make $56070 per year. What is the husband's ...
A: Sorry for the extremely late reply. This has been a hectic week since my computer crashed. ...
|
| Trigonometric Functions | 12/3/2008 |
Q: Provided, I am given the radians: pi/4. The function is in secents. I know that the degrees should ...
A: Sorry for the extremely late answer. My computer went down and I had a real hectic week. Anyways, ...
|
| Determine Interest Rates | 12/1/2008 |
Q: Can you determine the answers to the following question by using a simple calculation? An investor ...
A: Hey Kenneth, This problem can be done in two ways. One way is guess and check, the other is ...
|
| Geometry/Advanced Mathematics | 11/30/2008 |
Q: do you have any formula in which you can identify how the minute hand and hour hand interchange? ...
A: This is a very complicated question. You don't need a formula to solve this question. You only need ...
|
| SOLUTION TO POWER | 11/29/2008 |
Q: hOW TO SOLVE "n" IN equation: R = 1-(1-C)^n Tried to raise to power but got "lost"
A: For these kinds of equations, you must be familiar with logarithms. If you aren't, you should learn ...
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| math in mind | 11/26/2008 |
Q: There are some people who can multiply 8 digits with another 8 digits in their mind. Also I have ...
A: Well, there are tricks to do multiplication, but for 8 digit numbers, it is very difficult with ...
|
| 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: This is a very intelligent question! To answer it, there are indeed many real-life applications to ...
|
| Fibonacci numbers | 11/21/2008 |
Q: How do Fibonacci numbers work? Could you walk me through a real number example? I'm having trouble ...
A: Well, the easiest way to learn fibonacci numbers is through an example. So 1,1,2,3,5,8,13,21,... is ...
|
| Regarding pi | 11/19/2008 |
Q: I read that pi is an irrational number (number whose digits are never ending). I was wonder how is ...
A: Good question. The reason that it is possible is because being irrational does NOT mean that it is ...
|
| Algebra 2 | 11/18/2008 |
Q: I am working on inverse functions. I have to find the inverse function of P(x) = 4 times [cube ...
A: y = 4(8x+3)^(2/3) + 25 (y - 25)/4 = (8x+3)^(2/3) ((y-25)/4)^(3/2) = 8x + 3 x = -3 + ...
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| Proofs | 11/10/2008 |
Q: Let a and b be elements of the set of integers. Prove that if a^2+b^2 is equivalent to 0(mod3), then ...
A: Well, basically we have to prove that it is impossible to have a congruent to 0 while b isn't. So ...
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| Proofs | 11/8/2008 |
Q: Let a and b be elements of the set of integers. Prove that a^3 is equivalent to a(mod3)
A: Let us take this in two cases. Case 1: a = 0 (mod 3). Well, if 3 divides a then 3 also divides a^3 ...
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| Discrete Mathematics | 11/2/2008 |
Q: Chapter 7- Linear Programming Write the constraints as linear inequalities and identify the ...
A: When it says not more than, what it means is less than or equal to. Conversely, when it says not ...
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| Discrete Mathematics | 10/27/2008 |
Q: Chapter 6- Systems of Linear Equations and Matrices Use the coding method to encode the message. ...
A: I'm afraid that this is a problem that you will have to figure out on your own. I don't think that ...
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| Continuous compounding | 10/26/2008 |
Q: Can you please tell me how to enter the following problem on a financial calculator: 2ln(1+.1/2) ...
A: Your calculator should have a button that says ln. Most scientific and graphing calculators do. So ...
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| Discrete Mathematics | 10/24/2008 |
Q: Systems of Linear Equations and Matrices Determine whether the given matrices are inverses of each ...
A: 1 1 2 -10 (1*2 + 1*-1) (1*-10 + 1 *10) 1 0 .1 .2 * -1 10 = (.1*2 + .2*-1) ...
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| Discrete Mathematics | 10/23/2008 |
Q: could you help me with this question. Thanks Chapter 6- Systems of Linear Equations and Matrices ...
A: I'm afraid that using Gauss-Jordan Method for this problem would be very difficult for me to show ...
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| consecutive integers | 10/17/2008 |
Q: find four consecutive integers such that three times the third, decreased by the second, is the ...
A: Suppose that the smallest integer of the four is x. Then the integers will be x, x+1, x+2, x+3. So ...
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| Math | 10/15/2008 |
Q: Ca you help me with this? . A drug company is considering manufacturing a new product that has two ...
A: Hey Jalisa, I cannot draw a venn diagram on the internet due to obvious reasons, but I can answer ...
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| Area | 10/13/2008 |
Q: I came across this question when looking through this book. How do you find the area of a do ...
A: For this question, it is best to start with one center point in the middle. Next, if you connect it ...
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| Functions and slope-intercepts | 10/11/2008 |
Q: Can you please help with these? I would greatly appeciate it. 1) True or False - The following ...
A: I usually don't answer so many questions at a time, but I'll make an exception. Just know that ...
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| math proof | 10/7/2008 |
Q: How to prove Fx1 = FX1Cos Theta + FY1Sin Theta and Fy1 = -FX1Sin Theta + FY1Cos Theta? The question ...
A: Sorry for the late response, I've had a lot of work. This statement is not true, so it cannot be ...
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| math | 10/6/2008 |
Q: 2^n=52 what is the way to calculate n?
A: There is a way to calculate n. In order to do this, you have to be familiar with the logarithm. ...
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| natural log | 10/4/2008 |
Q: how do I calculate (ln4)^2 thank you
A: To calculate (ln 4)^2, the only way to do this is with a calculator. Most calculators have the ...
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| Distance, Rate, and Time | 10/2/2008 |
Q: Bob Rodriguez, the Albany, NY sales representative for Advanced Drafting Software, Inc., must attend ...
A: For this question, simply find the total time taken. For the train, the total time would be total ...
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| maths | 9/28/2008 |
Q: PLEASE HELP!!! How do you rewrite an expression as a power of a given number? e.g 16 to the power ...
A: You would first write the number as a power, and then raise it to the other number. Check out this ...
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| maths problem!! | 9/28/2008 |
Q: . just need your help answering this question.. the question is a trapezium has an area of 25 cm ...
A: The formula for area of a trapezoid is (b + t)/2 * h = 25. Now the h = 5 since that is the height. ...
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| Trig Interval | 9/26/2008 |
Q: f(x) sin(2x-3)-1/2x+1 where x is in radians show that there is a root alpha of f(x) in the interval ...
A: Sorry for the late reply, I haven't gotten much time lately. To show that there is a root in between ...
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| SAT math | 9/25/2008 |
Q: The expert can't answer your question. Your Question was: Hey Robi I need your help again! Page ...
A: Sorry about the confusion, Since there are p positive and n negative, the probability of a positive ...
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| Centroid of a isoscel triangle in polar coordinates | 9/24/2008 |
Q: I have a circle of radius R. I want to divide this circle in 12 identical isoscel triangles, of ...
A: This problem proved to be challenging so I took a long time to get it. I think that your easiest ...
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| Permutation Problem | 9/24/2008 |
Q: Suppose you have members of six families which each consist of a mom, a dad, and a kid. How many ...
A: So, you have 18 people in six families and you have 18 chairs. You want the members of each family ...
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| discrete mathematics | 9/23/2008 |
Q: Prove by mathematical induction that SQRT(2)/2 + SQRT(3)/4 + SQRT(4)/6 +...+ SQRT(n+1)/2n > ...
A: For this problem, it is obvious that the case n = 1 works. Now all we have to do is that assuming it ...
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| Angle of Elevation | 9/22/2008 |
Q: Students are trying to determine the height of a tower. Mark is standing 7m away from Susan and ...
A: For this problem, you can set up two equations and have two variables. Let x be the height of the ...
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| find p | 9/21/2008 |
Q: If p is an integer and 3 is the remainder when 2p+7 is divided by 5, then what value is p? I got 4 ...
A: It said that when 2p + 7 is divided by 5, it leaves a remainder of 3. This means that it will ...
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| find p | 9/20/2008 |
Q: If p is an integer and 3 is the remainder when 2p+7 is divided by 5, then what value is p? I got 4 ...
A: For these kinds of problems, it helps to use an equation. So 2p + 7 is congruent to 3 mod(5). In ...
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| Integers | 9/20/2008 |
Q: If x is an integer greater than 1 and if y=x+(1/x), which of the following must be true? I. y≠ ...
A: Great problems! For this question, the easiest way to approach it is to try to prove each thing ...
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| Integration | 9/20/2008 |
Q: Integral of (x^2-1)/(x^2-16)
A: Calculus is one of my all-time favorite subjects and I always find a nice question interesting. ...
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| geometry | 9/19/2008 |
Q: i need help with the following questions: if the length of each edge in a cube is increased by the ...
A: For the first question, assume that it was an x percent increase. Also, you can assume that the ...
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| GRE | 9/19/2008 |
Q: An enterprise has a value of 10 - 20millions. If they give shares worth 100$-1000$ to all their ...
A: For this question, you find the average amount of employees. So 10 million divided by 100 is 100000. ...
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| math | 9/18/2008 |
Q: We have a span of deck railing. It is 39" from 2x4 to 2x4. We have spindles that are 1 3/8" wide and ...
A: I'm not really much of a carpenter of any sort so I'm not sure what you mean by 2x4s and spindles. ...
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| parabola | 9/17/2008 |
Q: there's a graph to this question, but i don't know how to draw it here so i'll try my best to ...
A: I'm terribly sorry for taking so much time to answer. I've had a lot of work lately. For sideways ...
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| Logic | 9/17/2008 |
Q: 1)(LOGIC) At a party there are 2 more men than women. If 4 men were to leave and 2 women were to ...
A: On question two, it is asking what you know for certain, not what might be true. This means that the ...
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| SAT Math | 9/17/2008 |
Q: For what integer value of x is 3x+5>11 and x-3<1?
A: I'm terribly sorry for answering this late. I've just had a lot of work lately and haven't really ...
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| equations with square roots | 9/16/2008 |
Q: square root (x^2-t^2) = 2t-x If x and t are positive numbers that satisfy the equation above, what ...
A: For this problem, you have to play around with it a bit. So sqrt(x^2 - t^20) = (2t - x) This means ...
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| integers | 9/16/2008 |
Q: If x is an integer and 2<x<7. How many different triangles are there with sides of lengths 2, 7, x? ...
A: For this problem, you have to take into consideration the fact that any two sides of a triangle MUST ...
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| help | 9/16/2008 |
Q: You are the cleverest person I don't know so riddle me this if you will... How can i make 5, 6, 6, ...
A: For this problem, you just have to think about ways to make four. Now the first thing I thought of ...
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| Logic | 9/14/2008 |
Q: 1)(LOGIC) At a party there are 2 more men than women. If 4 men were to leave and 2 women were to ...
A: Good questions! For the first question, the best way to do it is to set up equations. Let m be the ...
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| SAT math | 9/14/2008 |
Q: Esther drove to work in the morning at an average speed of 45 miles per hour. She returned home in ...
A: For this question, the best way to do it is to think about time. You know that she takes one hour ...
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| SAT math | 9/14/2008 |
Q: In the xy-plane, the equation of line l is y=2x+5. If line m is the reflection of line l in the ...
A: When you reflect lines over the x axis, all you have to do is change the y to a -y because ...
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| SAT math | 9/13/2008 |
Q: What is the midpoint of the line segment described by (1,4) and (3,7)? I don't know how they got the ...
A: To find the midpoint of a line segment, what you do is find the midpoint of the x coordinates and ...
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| logarithm sequences | 9/12/2008 |
Q: "Describe how to obtain the third answer in each row from the first two answers" a)log[base7]49, ...
A: For a) you notice that 7 is 7^1 and 49 is 7^2. This means that the third term should have base 7^3 ...
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| logarithm bases | 9/10/2008 |
Q: how do you find the nth term in this logarithm sequence: log[base 2]8, log[base4]8, log[base8]8, ...
A: Well basically, you notice that each term in this sequence is pretty much the same except for the ...
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| finite math | 9/10/2008 |
Q: A three digit number is formed using the digits from {1,2,3,4,5,6} How many such numbers are ...
A: Well, here are the solutions. 1) Well you can have 6 different first digits, 5 different second ...
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| math question | 9/9/2008 |
Q: Using the numbers 2,4,9,6,7,3, Digits appear only once in an answer. each answer may not use all ...
A: I'm not too sure what you are asking, but I will answer the question I think you are asking. If you ...
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| General Form of the equation of the circle | 9/8/2008 |
Q: I was reading your post on the standard form of a circle and I think I got that but I am having ...
A: It would basically look like this. (x-0)^2 + (y-0)^2 = 4^2 which is basically x^2 + y^2 = 16. Now ...
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| algebra | 9/8/2008 |
Q: A college dormitory houses 210 students ,This fall ,rooms are available for 76 freashmen .On the ...
A: Since 95% of those who ask get one, they should have 76/95*100 = 80 students apply. This is because ...
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| Solving | 9/8/2008 |
Q: 1. 3x + 2y= 6 2. y= 3/2x + 1 ANSWER: Hello Antonia, This is a good question. Basically, you ...
A: Oh, sorry, I misunderstood. Anyways, in this case I'm not sure what you are asking. Do you want me ...
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| Maths | 9/7/2008 |
Q: i need the formular to work out the diagonal length of a rhombus if the base is 56m and the height ...
A: It is impossible for a rhombus to have a base of 56 and a height of 59. This would mean that it has ...
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| mathematical rules | 9/6/2008 |
Q: I have heard of scientific theories and mathematical rules and I was wondering if there is any ...
A: Nice question. The difference between a rule and a theory is basically that a theory explains ...
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| Spherical Trig? | 9/5/2008 |
Q: This article appeared in National Geographic. Could you please tell me how the trig calculation was ...
A: I'm not sure I understand what they did either. It seems that they didn't really even try to explain ...
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| math | 9/4/2008 |
Q: write each number in expanded form using exponents. 1. 56,240,135,010 2. 907,002,920
A: 56,240,135,010 = 0*10^0 + 1*10^1 + 0*10^2 + 5*10^3 + 3*10^4 + 1*10^5 + 0^10^6 + 4*10^7 + 2*10^8 + ...
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| Volume | 9/3/2008 |
Q: Not if I have targetted the right person, but would appreciate your help. Salt absorbs water I ...
A: I'm not sure if Salt absorbs water. I think that salt dissolves in water. Also, I'm afraid you've ...
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| equations | 9/3/2008 |
Q: i need help solving this math equation with the rule being as follows. suppose=2x-2.5. Find x if ...
A: 2x - 2.5 = 10 2x = 12.5 x = 6.25 4x + 10 = 22 4x = 12 x = 3. Basically for each problem, just ...
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| Trigonometry | 9/2/2008 |
Q: i want to know the formula to calculate the area of contact of a circle touching a flat ...
A: It is a great question. The answer is, the area will be zero. The pipe will only touch the ...
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| Derivative | 9/2/2008 |
Q: I'm having trouble with one of my math problems and the answer is not in the back. Can you help? ...
A: I must say that this definetly is a challenging question. So in order to do this problem, you have ...
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| algebra | 9/1/2008 |
Q: a half-acre building lot is five times as long as it is wide. what are its dimensions? Note: 1 ...
A: Half of an acre is 21780. So let its width be w. Then the area will be 5w * w = 5w^2 = 21780 so ...
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| mathematical induction | 9/1/2008 |
Q: I need to prove by induction that 5^n+3 is divisible by 4 for all nЄZ+
A: Great question! Well in mathematical induction, you first verify it works for n = 1. So 5^1 + 3 = 8 ...
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| Trigonometry word problem | 8/31/2008 |
Q: A billboard is 20-ft, the bottom of which is 15-ft off the ground. There are two areas on the ground ...
A: I understand now what you mean. For the first two questions, you are very correct when you say that ...
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| Puzzle I cant solve | 8/28/2008 |
Q: Victims of a shipwreck were lost at sea. Due to strong waves th ey were all soon separated. Search ...
A: Nice puzzle. Well lets say that there were x survivors. SO after x/6 of them were found, 5x/6 ...
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| Grade 9 math | 8/28/2008 |
Q: Write the ratio of the number of vowels to consonants in the word "oxymoron" Consider y to be a ...
A: Basically, there are 4 vowels counting y and 4 consonants. SO the ratio of vowels to consonants is ...
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| trig problem | 8/28/2008 |
Q: i have to prove how these two trig formulas are equal could you help? (Cot(x)-1)/(Cot(x)+1) = ...
A: This seems about right and I have solved it. Take the right side and start simplifying. 1- sin2x ...
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| trig problem | 8/27/2008 |
Q: i have to prove how these two trig formulas are equal could you help? (Cot(x)-1)/(Cot(x)+1) = ...
A: Great question!! I also had a hard time with this question. Now, I just realized something, this ...
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| Geometry | 8/26/2008 |
Q: I'm having a problem understanding the theory behind determining if a set of coordinates lies with a ...
A: I must say this is very interesting. I found many ways of doing this, but one of the ways seemed the ...
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| finding the nth term in a sequence | 8/20/2008 |
Q: what is the nth term for the following sequence? and please eplain. 2 4 16 256
A: The following sequence seems to square each time. Observe that 2 squared is 4, 4 squared is 16, and ...
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| Trignometric Proof | 8/19/2008 |
Q: I have a problem with a trignometric proof. I tried my best but can not be able to prove. Can you ...
A: You could start at the left side of this equation and start simplifying, but that would be hard and ...
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| hyperbola | 8/9/2008 |
Q: i was wondering if you could please put the hyperbola -4x^2 + 9y^2 - 32x +90y +17 = 0 in ...
A: -4x^2 + 9y^2 - 32x + 90y + 17 = 0 -4x^2 - 32x + 9y^2 + 90y = -17 -4(x^2 + 8x) + 9(y^2 + 10y) = -17 ...
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