The length of a rectangle is 4 times the width. the perimeter is 90 cm find the width and length

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?

The function models the number of accidents

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.