According to the graph what is the value of the constant in the equation below

Which statement describes surface features called maria on the moon

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.

The answer is 7.2 how would you put this as money