What is the value of x?

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

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !