Which of the following expressions best represents the following scenario?

The total bill, b, at a restaurant is first recalculated to include 6% sales tax and then recalculated to include a 16% tip.
a. 1.06(0.16 b) + 0.16 b
b. 1.06 b + 0.16(1.06 b)
c. b + 0.16(1.06 b)
d. 1.06 b + 0.16 b

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.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

∆red ≅ ∆ by rule will give brainiest if possible