When the air in a hot-air balloon is heated to 100 degrees fahrenheit, each cubic foot of air can lift about 7 grams. the function f(x) for the number of grams that can be lifted by a balloon containing x ft^3of air is f(x)

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.