PLEASE HELP WITH ANY IF THE QUESTIONS IN THE PICTURE I WILL GIVE 50 POINTS AND BRAINLEIST

What is the frequency of the sinusoidal graph?

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.

If a=0.333333 and b=0.55555, what is the value of a+b