I'll rate brainiest answer and 5 stars i suck at math

Three coins are flipped. what is the probability that there will be at least two tails?

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?