Hi! I need help in this question, its solving for x, which should be easy.

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

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.

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs