The expression n2 + n represents the total number of blocks used in the nth figure of a pattern. use the equation n2 + n = 56 to determine which figure has 56 blocks.

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.