Sterre charges \$35$35dollar sign, 35 to file tax returns, but files for free if she only needs the easiest form. then she donates \$2$2dollar sign, 2 to clean water projects per tax return she files. sterre charged \$7{,}245$7,245dollar sign, 7, comma, 245 and made a donation of \$1{,}242$1,242dollar sign, 1, comma, 242 this year for the tax returns she filed.
how many tax returns did sterre file at each price?

Harold wrote this equation to model the level of water in a pool over time. the variable x represents time in hours. f(x) = 3,500 - 225x which statements about the situation are true? check all that apply. the water level is rising. the water level is falling. the initial level of water in the pool was 3,500 units. the initial level of water in the pool was 225 units. the pool was empty after 14 hours. the water was 2,600 units high after 4 hours.