Diego is selling raffle tickets for $1.75 per ticket. 1- How much money would Diego earn if he sold 20 tickets?
2-How much money would Diego earn if he sold 50 tickets?
3-Write an expressions that represents how much money Diego would earn if he sold "r" tickets.

Carmen and matt are conducting different chemistry experiments in school. in both experiments, each student starts with an initial amount of water in a flask. they combine two chemicals which react to produce more water. carmen's experiment starts with 30 milliliters of water in a flask, and the water increases in volume by 8.5 milliliters per second. matt's experiment starts with 10 milliliters of water and increases in volume by 28% each second.