Plz help ASAP for 5 points

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

The radius of a sphere is 3 inches. which represents the volume of the sphere?