Which expression represents the sum of (2x-5y) and (x+y)?

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.

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?