This proof shows that the product of two rational numbers is

solution:

Let X and Y be two rational numbers. By definition, X and Y can be written as a quotient of two integers.

Integers are closed under multiplication. That is, the product of any two integers is an integer. Therefore, ab is an integer and cd is an integer. Thus, XY is written as a quotient of two integers. Therefore, by definition of a rational number, XY is rational.

2.

according to newton’s cannonball model, what happens if the cannonball's velocity is enough to overpower the pull of earth’s gravitystep-by-step explanation:

answer: the four apples you took away.

step-by-step explanation: