Did Rachel make an error in evaluating the expression? A. Rachel did not distribute the negative correctly in Step 1. B. Rachel did not subtract correctly in Step 3. C. Rachel did not make an error. D. Rachel did not subtract correctly in Step 2.

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.