NEED HELP ASAP ! Question on the photo

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5