Ineed on #16 and #14, when i did question 15 it was fine but i keep running into problems on how to solve 14 and 16

What expression is equivalent to 1/2(2+3x-6)

Pranza plotted point a in the coordinate plane below.

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.