Question

8

Answer 1

if you had f(x) it is a function of x
if you have f(3) you substitute x=3
so you have f(g(x)) so you have a function of g(x) meaning f(g(x)) you let x=g(x)

so you have f(x)=-4x+7
then
f(g(x)) = -4(g(x)) + 7

f(g(x))= -4(10x-6)+7

Answer 2

you are welcome :)