Which phrase describes carbon-14 dating? uses the rate at which nitrogen-14 decays into carbon-14
dates the remains of organisms to determine when they died
measures the number of unstable elements in ancient volcanic rocks
determines the age of ancient fossils older than 50,000 years old

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.