Studies show that most children need an average of ten hours per sleep, while most adults only require an average of seven hours of sleep. The data shown on the scatter plot below represents the relationship between a young boy’s age (in months) and the average number of hours that he sleeps each night.

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.