Pls help will give brainliest if it lets me

How do i put 3(x+7) in distributive property

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.

Given that s is the centroid of triangle mno, find sq.