Find the simple interest paid to the nearest cent for each loan, interest rate, and time. $500, 12%, 18 months

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

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip