The running back for the bulldog football team carried the ball 9 times a total loss of 20 1/4 yards (1/4 is mixed number with 20). Find the average change as a simplified mixed number.( Please tell me how u found it too)

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.