As the question is currently written:
1. f(x) = -4 so f(-10) = -4
2. g(x) is irrelevant
At a minimum, you probably omitted a set of parenthesis.
Depends on what f(x) is!
If it's, which it MOST likely is, then it's .
You NEED to use parentheses, so a function such as this will not be AMBIGUOUS!