780 miles on a full tank of 16 gallons find the rate of miles

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.