Bob has two bananas, harry has three bananas. who has more bananas

Ineed to learn how to solve this problem

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.

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!