Posted by **Lacey** on Sunday, October 14, 2007 at 9:55pm.

I'm working on a couple of SAT math programs for school, and I have trouble figuring some out.

1. Joe is 3 years younger than Kate. If n represents Nora's age now, what was Kevin's age 4 years ago, in terms of n?

A. N + 7

B. N + 1

C. N - 1

D. N - 4

E. N - 7

2. If (x + y)^2 - (x - y)^2 = 84 and x and y are positive integers, which of the following could be a value of x + y?

A. 10

B. 12

C. 14

D. 16

E. 18

Thanks so much in advance!

- SAT Math? -
**bobpursley**, Sunday, October 14, 2007 at 10:02pm
1. Not possible to solve. Too many kids named.

2. You have a diference of two squares, it factors to (x+y-x+y)(x+y+x-y) which reduces to 2y*2x=4xy or then solve for x,y

4xy=84

xy=21 and 7 and 3 fit that real nicely.

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