If you don't know these, these are called the diamond problems. there are two numbers on each side, and in the bottom box, it is the sum of adding them together, and in the top box, it is the sum of multiplying together. i have no idea about #'s, a, b, and f, can you guys me? !

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.