Name all the sets of numbers the number 8 belongs to

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Find the balance at the end of 4 years if 1000 is deposited at the rate of

What is the first step of an indirect proof of a number that is divisible by two