Which polynomial can be simplified to a difference of squares?

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.

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.