If f(x)={(3,5), (2,4), (1,7)} and h(x)={(3,2), (4,3), (1,6)}, (f +h)(1)=?

Question

I am going into AP calculus in a few weeks when school starts and i have a review packet. Other people and I are having such a hard time solving these problems. Someone help me!
All the problems of the section are found at:
http://img105.imageshack.us/img105/3991/calcccqk4.png

Answer 1

1. (f+h)(1) = f(1) + h(1) = 7 + 6 = 13
©
2. (k-g)(5) = k(5) - g(5) = 30 - √2

3. (f∘h)(3) = f(h(3)) = f(2) = 4

4. (g∘k)(7) = g(k(7)) = g(54) = √51

5. inverse of f(x) = {(5,3), (4,2) , (7,1)}

6. inverse of k(x)
y = x²+5 ... y-5 = x² ... ±√(y-5) = x.
thus inverse of k(x) =
√(x-5) , if x ≥ 0 for k(x).
-√(x-5) , if x < 0 for k(x).

7. 1/f(x) = {(3,1/5) , (2,1/4) , (1,1/7)}

8. (kg)(x) = k(x)g(x) = (x²+5) √(x-3) , x≥3.

Answer 2

(f + h)(x) just means f(x) + h(x). The info you were given tells you that f(1) = 7 and h(1) = 6. Therefore, (f + h)(1) = 7 + 6 = 13.

Answer 3

f is a function, and (1,7) in f means that f(1) = 7
Likewise, h(1)=6

(f + h)(1) = f(1)+h(1)=7+6=13

Answer 4

i'm going to take a wild guess...

f= {15,8,7}
f=840

h={6,12,6}
h=432

(f+h)(1)
=(840+432)(1)
=1272(1)
=1272

hope i helped