5y (x+n) + 3ny

And

4a(a+b)-2ab-a2

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

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?

Which of the following contains a variable?