45x^4 + 72x^3 is factored form

Ineed in figuring out this problem.

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')