Which formula gives the coordinates of the midpoint of the segment connecting points (u, v) and (s, t)?

Which of the following of the following sets of side lengths could not form a triangle?

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie