HELP PLEASE! TEN POINTS! NO LINKS OR I WILL REPORT! Please explain it if you can, I just began learning about these and don't quite understand how to solve them, and I have a test coming up so I gotta figure it out XD.

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

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