Start from inside to the out side of the function; h(5)=10/5=2 g(h)=g(2)=3*2=6 now, get the f inverse of x; f(x)=y=x+6 x=y-6 replace x with y and y with x y=x-6 so f^-1= x-6 so f^-1(g)=f^-1(6)=6-6=0 I am not sure only of the last value, but pretty sure of the rest.
