1. H

    Surface area over y-axis (integrating wrong)

    The book says the answer is 15\pi\sqrt{17} I have tried to manipulate the numbers to try to get that answer, but I don't know what mistake(s) I am doing.
  2. P

    Volumes of revolution problem: Where did I go wrong?

    The picture shown below shows two problems. I attempted to solve the one on the left, but the answer I received does not match the answer in the back of the textbook. I would like to know where I went wrong when attempting to solve this problem. 1. Using the values shown, I created the...
  3. P

    What is wrong with the power equation?

    So I went through this problem and I'm not sure if I'm using the wrong formula or something or I made a mistake, but I would love if someone could check my work and tell me what I'm doing wrong What is the power of the following information given that u = 51.0 with significance level of .05...
  4. M

    Someone who knows what I'm doing wrong in JMP?

    Hi I'm currently doing a Two-factor ANOVA in JMP. When I work the data out in JMP, I get the first attachment. However, in the teacher's solution, it's as seen in the second attachment. Someone who knows what I could be doing wrong in JMP? I can also attach the data if you would like. // MIO
  5. rebirth61213

    Probability problem involving a quadratic. (not sure where I went wrong w/ this).

    The question goes like this: "The probability of a biased coin showing heads on any throw is p. The probability that the coin shows heads exactly once in two throws is 0.42; find the two possible values of p." I'm not quite sure where I went wrong w/ this... Let p = prob of head x = prob of...
  6. O

    Lagrange Multiplier constraint optimization (where am I going wrong)

    Okay, so the problem seems pretty basic but I am getting two values for my lagrange multiplier (I have attached my solution) Part a is asking me to find the optimum values which is x=y=z Part b is where I think I am going wrong, we are asked to take the derivative of our optimal value function...
  7. T

    Am I wrong for this polar conversion?

    Prof just put exam solutions, and I think he is wrong. Basically the question asked to convert a double integral in terms of x and y and to a polar integral (just rewrite it... dont solve it). I had the limits correct, but for the actual function the solutions says it should be...
  8. S

    I don't understand why I did net worth wrong.

    Phillip Smith age 37, decides to plan for his retirement 30 years from now. He currently has a net worth of $50,000 that is expected to grow at a rate of 5 % compounded annually. His employer will contribute $4000 at the end of each year into a retirement plan. This plan invests half of the...
  9. T

    I think my cal1 book may be wrong. Can someone take a look please.

    Please see question #43 here is the question here is the answer in the back of the book I suspect that they may have meant to write 9 and not 9x.... or im just new to this and not coming up with the correct answer. Thanks!
  10. Q

    Not quite sure what I did wrong. Cosine equation

    Okay, so we were ask to find all solutions for cos(t)=.72 and round to 2 decimal places where appropriate. I got .77+2pi and 2pi-.77+2pi but that not right. So, whats the right answer. Thanks in advance.
  11. F

    TRIG SUBSTITUTION INTEGRAL- Where did I go wrong?

    Imgur: The most awesome images on the Internet This imgur link shows my paper work and the solution manual to the problem I am trying to solve. My question is: how does the solution manual use "1/cos(x)" and end up with the integral of "cos(x)/sin^2(x)" whereas I use "sec(x)" and end up with...
  12. T

    Where am I going wrong? Ratio Test...

    Can't seem to figure out what the problem is.... ratio test: \frac{a_{n+1}}{a_n} \frac{2^{n+1}(n+1)!n^n}{{(n+1)}^{n+1}2^nn!} \Rightarrow \frac{2(n+1)n^n}{(n+1)^{n+1}} \Rightarrow \frac{2n^n}{(n+1)^n} \Rightarrow 2 The ratio test says, if the limit is greater than 1, the series diverges...
  13. W

    What am I doing wrong in this derivative?

    I have been working on derivatives, but now the homework problem's "show example" skips to immediately finding the derivative and every time I am getting a different answer. The original equation is y=((x-3)/(x+1))^2. The derivative is (8x-24)/(1+x)^3. My answer was (2x-6)/(x+1)^3. I am not...
  14. M

    functional maths. very basic please help (sorry if in wrong place)

    1. How many fatal casualties were caused by fires between 2010/11 and 2012/13? a. 882 b. 129624 c. 782 d. 556 e. 316 2. In 2012/13 how many more fatal casualties occurred in an area where a fire alarm was present than in an area where a fire alarm...
  15. S

    MTEL 53 Multipling Fractions Problem - I think the answer key is wrong.

    Hi, I'm studying for the Math 53 MTEL Math Licensing and there is a question I'm terribly confused with on the practice test. Question #15 on MTEL 53 Practice Test 2 and 1/2 times 1/4 (2.5 x .25) Which of the following problems can be solved using the operation above (multiplication)? A) A...
  16. Z

    Difference equation gone wrong

    The picture says it all, sorry for the scribbles
  17. T

    What is wrong with my answer? differential equations, calc 2.

    I tried entering all possible answers. i used 3C instead of K, and webassign would NOT take my answer. this is my last try, and i cant figure out what to fix.
  18. sakonpure6

    Why is this series representation wrong?

    Hello, I am asked to represent \int \frac{e^x}{x}dx as a power series and I proceeded as follows: We know: e^x = \sum_{n=0}^{\infty} \frac{x^n}{n!} So, \frac{e^x}{x}=\sum_{n=0}^{\infty} \frac{x^n}{x\cdot n!} = \sum_{n=0}^{\infty} \frac{x^{n-1}}{n!} Then, \int \frac{e^x}{x}dx = \int \left...
  19. K

    Not sure what I did wrong in this integral

    Hi, The integral is \int \frac{x-1}{x^2-4x-5}. I tried to first do a little manipulation and add -1 + 1 to the integral to get: \int \frac{x-2}{x^2-4x-5} + \int \frac{1}{x^2-4x-5} The first one solves easily using u sub, the second I solved using partial fractions: \frac{A}{x-5} +...