f◦g(x)= f(g(x)) = f(2x-4) = |2x-4| g◦f(x)= g(f(x)) = g(|x|) = 2|x|-4 f◦f(x)= f(f(x)) = f(|x|) = ||x|| = |x| g◦g(x)= g(g(x)) = 2(2x-4)-4 = 4x-8-4 = 4x-12 Edwin