Help me with Anti-Derivative Problem.

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

F(x) = 2x + 1? h(x) = x – h(x) = x + h(x) = x – 2 h(x) = x + 2

Factor the gcf out of the polynomial 9x^6+6x^4+15x^3