What expression is equivalent to 9-8x

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

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11