Acolony of bacteria is grown under ideal conditions in a laboratory so that the population increases exponentially with time. at the end of 5 hours there are 40 comma 000 bacteria. at the end of 9 hours there are 50 comma 000. how many bacteria were initially present?

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.