Thomas owns a car shop that runs out of his garage. he changes oil in people's cars and checks their tire pressure. Each time he changes the oil in a car he makes $15. He needs to make $480 this week to pay off a bill he has. How many cars must he service in order ti make this money?​

What is the number 321,000,000 in scientific notation? also what is the number? ?

The area of square garden is 300m squared. how long is the diagonal?

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?