HELP PLEASE

(btw the other screen shot is what i put for b)

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.

What are the values of each variable in the diagram below?

Ihonestly have no clue if it's each or none.