Help me with this pls

Ineed asap.i cant understand this question i need someone to me right away

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.

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer