What are the steps to finding an equation of a proportional relationship

Acylinder has volume 45π and radius 3. what is it’s height?

Describe the domain and range of y=2(3)^x-2+5

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?