wrong

1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Difference equation gone wrong

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