Find g[h(x)] and h[g(x)]

"I was able to do all 10 questions but these 2"

g(x)=x+4

h(x)=x+9

g(x)=|x|

h(x)= x-3

if f(x) =x^2, g(x)=3x, and h(x) = x-1 find each of the following

"I don't remember learning about this in class"

g[f(x)]

[f o h](3)

Find the inverse of each function

f(x)=3x-4 "is the answer f(x^-1)=(x-6)/3"

g(x)= (-3x+1)/2

h(x) = 4x^2 +12x + 9

Are the following functions inverses

"I don't even know what to do here"

f(x) = (2x-8)/2

g(x) = x +4