Please help me AND ALSO PLEASE EXPLAIN HOW YOU WORKED IT OUT thank you.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Ineed here’s a picture of the question

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.