I received a $3 discount on a $20 phone case. What was the percent of discount?

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

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?