Statins are used to keep cholesterol in check and are a top-selling drug in the u. s. the equation: s − 1.9 x = 5.7 gives the amount of sales ( s ) of statin in billions of dollars x years after 1998. according to this equation, how much will/did people in the u. s. spend on statins in the year 2011?

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.