Please Help!!! Not good with functions.

1.) For the pair of functions, f(x)=x^2+5 and g(x)=x+3, find the following.
a) (f*g)(x) b) (f*g)(2) c) (g*f)(x) d) (g*F)(2)

2.) Find a formula for the inverse f(x)=x+7. f(squared -1)(x)=?

3. Evaluate the function for the given value of x. f(x)=4^x x=-4 f(x)=?

1a) x^2+6x+8
1b) 30
1c) 12
2) f (x)^-1 = x-7
3) 1/256