The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

How can you tell when x and y are not directly proportional?

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?