Answer and ill mark brainlist!!

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.