Please I need help with my math work I don’t understand it

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

40 points which is the equation of a line perpendicular to the line with the equation: y = 1/4x + 2 a : y = -4x - 7 b : y = 4x + 2 c : y = 1/4x - 1/2 d : y = -1/4x + 3