Rose went to a stationary shop. she purchased 2 packs of red pens,4 packs of black pens, and 3 packs of blue pens. the cost of each pack of pens was $2.50.which expression shows the total amount rose spent on the pens.

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.