Acollege has 480 students. each student is numbered 1 through 480. a sample of 25 students is needed, so a computer randomly generates 25 numbers from 1 through 480. what kind of sampling method is being used?

convenience sampling

simple random sampling

systematic sampling

volunteer sampling

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?