If you are given al the values except r, how do you rewrite the formula to solve for r

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Match the one-to-one functions with their inverse functions.