Answer + ! lucia finds that (3x^2 + 3x + 5) + (7x^2 - 9x + 8) = 10x^2 - 12x + 13. what error did lucia make? a. she found the difference instead of the sum. b. she combined the terms 3x^2 and 7x^2 incorrectly. c. she combined the terms 3x and –9x incorrectly. d. she did not combine all like terms.

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.