The height of a pumpkin launched from a cannon is given by the function h = -16t² + 240t + 16 where t is the time in seconds. How many seconds is the pumpkin in the air? (Please work me through it)

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?