URGENT!! Really need help on this test

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.