Can you help me in this question?

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 word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319