There is 3 questions help asap

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.

Find the average rate of change for the given function drom x=1 to x=2

An item that has been marked up sells for a profit. if an item sells that has been marked down, can it still produce a profit? explain.