Need help breaking this code pls

Arectangular prism is 3 meters long, 6 meters wide, and has a height of 9 meters. what is its surface area?

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.

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?