(bonus) a set s of ordered pairs of integers is defined recursively by (1) (1,2) ∈ s and (2,1) ∈ s, and (2) if (m, n) ∈ s, then (m+2,n) ∈ s, and (m, n+2) ∈ s, and (m+1,n+1) ∈ s. there is a simple description of the ordered pairs in s. what is it? your description should be good enough so that you can instantly decide if (12236,912242) is in s.

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.