The elevation of Death Valley, CA is 282 feet below sea level, while the elevation of Riverside, CA is 827 feet above sea level. How much higher is the elevation of Riverside than Death Valley?

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.