Can somebody help me

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?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Factor the polynomial by its greatest common monomial factor.