Find the GCF of 27x^2 and 45x^3y^2

Which of the following contains a variable?

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.

If f(x)=x+7 and g(x)=1/x what is (fog)(x)