[fast ]
supply the missing reason for statement 5 of the proof

The answer is CPCTC because ASA is used to prove that triangles are congruent and Reflexive property is used to show that something is congruent to itself. Hence, CPCTC is the only reasonable choice because it says that corresponding parts of congruent triangles are congruent.

Hope this helps :)

The vertex of the quadratic function is (1.5, -.75)