Is -8 an irrational or rational number?

Write a recursive sequence that represents the sequence defined by the following explicit formula:

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 able to prepare using the sauce?

Write 5 in the form of a/b using integers to show it as a rational number