Answer:
You didn't give an x for f(x)+g(x), so I don't know what number you want. OR if it would be correct because it can equal anything.
Step-by-step explanation:
7x - 10
f(x)= 5x - 7
g(x)= 2x - 3
f(x) + g(x)
= 5x - 7 + 2x - 3
= 7x - 10
15
-4x^2+5x-28
Expand -7(x^2 +4) = 3x^2+5x-7x^2-28
Simplify 3x^2+5x-7x^2-28 = -4x^2+5x-28
Answer: B correlation
