# More A2 Help

1. Oct 26, 2006

### GLprincess02

There are two more problems I am unsure of, so if someone could just check my answers, I'd be grateful.

Problem:
Suppose y=4/x.
a) Find the rate of change from x=1 to x=2
b) Find the rate of change from x=2 to x=3
c) Why are a and b not equal?

a) -2
b) -2/3
c) It is a hyperbola

Problem:
Suppose $$s=16d^2$$
a) How does the value of s change if d is doubled?
b) How does the value of s change if d is divided by 3?

a) s is multiplied by 2
b) s is divided by 3

Last edited: Oct 26, 2006
2. Oct 26, 2006

Problem 1 is correct

Problem 2 is incorrect. just look at d = 1. Since it is a squared term it would be multiplied by 4. And if it is divided by 3 S is (1/3)^2 = 1/9 S.

Last edited: Oct 26, 2006
3. Oct 26, 2006

### GLprincess02

Oh ok, I disregarded the square part. And you would still divide by 1/9 in part b, right? So the answer would be "s is divided by 1/9?"

Last edited: Oct 26, 2006
4. Oct 26, 2006

For your answer in (b) it would be divided by 9. Again this is because we have a squared term. If $$s = 16d$$ then it would be divided by 3 because of the linear term. And s would also be multiplied by 2 if we had the linear term.

5. Oct 26, 2006

no S would be divided by 9

6. Oct 26, 2006

### GLprincess02

And I get it it now. Thank you for your help!

Last edited: Oct 26, 2006
7. Oct 26, 2006

### GLprincess02

Cool! But I'm confused...how do you know I like it?

8. Oct 26, 2006

### GLprincess02

Lol ok that makes sense! I use pretty much the same username for every site I'm on. Is courtigrad your name on youtube, too?