Lee opened a savings account paying compound interest. The amount, £A, in the account t years after he first opened it is given by
A= 1500 x 1.04t.
Lee decides to close his account when he has doubled his original amount of money.
At the end of how many years does he close the account?

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.