P(4a-5)=-3(4a-5)-12 how do i work this

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities