Find the unit rate. Write an equation to describe the relationship between the quantities.
1. It costs $42 for every 3 feet of fence. Let
y = the total cost and let x = the number of
feet of fence.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

What is y times x by? y is __ times x

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.