What is the base of the exponent in the function f(x)=3 times square root of 8 to the power of 2x  when the function is written using only rational numbers and is in simplest form?

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.