# trouble

1. ### Having some trouble with combining functions in the form y=af(k(x-d))+c

Hi, This is my first attempt at getting some help on this website so I apologize if I did anything incorrectly. I recently started MRC3U Grade 11 University Prep Functions through an ILC course, and I've come across a question that has me stumped. We have to describe the transformations that...
2. ### Having Trouble with composition Problem?

Find f \circ g and g \circ f Question: $f(x) = \left\{ \begin{array}{l l} 2x+3 & \quad \mbox{if x<3}\\ x^2 & \quad \mbox{if x \geq 3}\\ \end{array} \right.$ \[g(x) = \left\{ \begin{array}{l l} 7-2x & \quad \mbox{if $x \leq 2$}\\ x+1 & \quad \mbox{if x $>$ 2}\\ \end{array} \right...
3. ### Trouble with Line Integrals

(Looking at 2.9 and 2.10) Alright so I think if I can actually UNDERSTAND 2.9, 2.10 might be fairly simple. My thoughts so far: Since I'm using a dot product, I'm assuming I'll have to look at F(x) for x1, x2, ... xn. I'm a little uncertain what's being shown other than that, though. Is there...
4. ### I have been having trouble on this problem and would really appreciate some help

I've been trying to work through this problem for hours and I am not sure on how to go about solving this problem. Some help would be extremely appreciated. " Show the two synthetic division "lines" for the integral values on either side of the upper real zero of f(x)=x3-9x2-x-5 " I have...
5. ### Can someone help me with a few problems... having some trouble

Hi if someone could help me with the following questions that would be great! (with work) 1.Find the roots of the following equations a) 0=x^4 - 8x^2 + 16 b) 2x= 4x^3 - 2x^2 2. Find all of the zeroes in the following P(x)= x^4 - 4x^3 - 16x^2 + 21x + 18 3. Is (x+2) a factor of x^3 - 3x^2 -...

Solve R(dVe/dt) + (1/C)Ve + Pex = 0 for Ve, where R, C, and Pex are constants and with initial constant Ve(ti) = VT​
7. ### Having trouble with Linear Equations and Inequalities.

Hey everyone. I am having trouble with this problem and other similar problems: "In the lab, Bill has two solutions that contain alcohol and is mixing them with each other. He uses 100 mL less of solution A than solution B. Solution A is 17% alcohol and Solution B is 20% alcohol. How many mL...
8. ### Linear Equation Application trouble

I'm having trouble solving for something that has a triangle, most problems I encounter usually involves a rectangle. This problem for example, I can't solve, and theres not another one like it in the book so I don't see an example of another like this. The Bermuda Triangle supposedly causes...
9. ### Simple trig question giving me trouble

I was tutoring somebody in high school this morning and we were going over the use of graphing calculators (he gets to use them for tests and finals), and the chapter about graphing functions in his pre-cal textbook came up that gave me some trouble. I tried working at it for a bit, but couldn't...
10. ### Having trouble with finding the p-value and testing proportions.

I'll start off by saying that I'm not a fan of math, but when I work on it hard enough I eventually conquer it. I'm currently studying for my Stats final (which if I pass, will be my final math class in my college career). So anyway, with these two problems I can solve and work the formula...
11. ### Im having trouble with these

cos(tan^-1 5/12 - tan^-1 13/4)
12. ### Trouble understanding method of variation of parameters

Problem: y'''-3y''+4y = e^2x, solve using method of variation of parameters. Aux polynomial: r^3 -3r^2+4 = (r+1)(r-2)^2 therefore Y(homogeneous) = ae^-x + be^2x +cxe^2x. Now normally I would just take a guess at the particular solution and say its of the form: Ax^2e^2x. Then I would find...
13. ### Having trouble proving answer

I asked a question on here previously, can be found here, http://mathhelpforum.com/calculus/241419-help-calc-question.html and I hve been busy but haven't gotten around to finishing it until now. The question asks me to prove that the answer is a minimum. Usually to do that I'd take the x...
14. ### Having trouble with these two problems [area and volume by integration]

Hi, The first problem is "find the area of the graph defined by: y=2x,\, y = x^3 -3,\, x = -2,\, x=1. I don't have any trouble sketching the graph, it's just that I don't understand the influence of x = -2. It seems like it's completely separate from the other curves and has no influence on the...
15. ### trouble understanding a part of the egg dropping puzzle

Hello, I have been thinking about this part of the egg dropping puzzle now for a couple of days, but haven't been able to come up with a reason. I don't understand why,if the egg doesn't break when dropped some floor n, the next time, rather than jumping up another n floors, instead we step up...
16. ### Having trouble with the chain rule

Hey guys, So there's this question H(s) = cot(s^3-2s) I ended up getting -csc^2(s^3-2s) - cot(3s^2-2) I have attached an image of the answer from the book. I don't understand how they got rid of the cot. I used the product rule for this and the chain rule. I've been getting multiple...
17. ### Having trouble coming up with the right answer

Hello, Here is the question. The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard deviation is$.20. QUESTION Calculate the...
18. ### Trig trouble

hello I am having trouble with a problem I would appreciate some help :) in degrees a)find exact solutions b)find all solutions [0-360deg] tan(2theta-90deg)+1=0 ^^I have trouble when the problems introduce multiple terms in the parentheses also if someone could tell me why this next problem...
19. ### Having trouble finding a derivative

I've tried taking the derivative of this function twice. Both times I have gotten the same answer. If anyone can see where I'm going wrong, I would greatly appreciate it.
20. ### having trouble with this

Hi; I'm having trouble factoring x^2 - 4x + 16 don't know why? Thanks.