yes

no, what if x = 0? would that be a problem?2) g(f(x)) = 1+ +3x Domain: x greater than 0

no, what if x is negative?3) f(f(x)) = f( ) =3^1/2 times (3x)^1/4 I do not know how to type square root of square root. Anyway, is the answer above correct? Domain: all real numbers

yes4) g(g(x)) = g(1+x+x^2) = 1+(1+x+x^2)+(1+x+x^2)^2 = x^4+2x^3+4x^2+3x+3 Domain: all real numbers.