If you had 5 $20s ($100) and you have $40 left, how many 20s did you use?

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?