How do i round 4,398,202 to the nearest 100

What is the slope of the line that contains the points (-2,1) and (0,-3)

Tom drove 206 miles in 3.9 hours. estimate his average speed.

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.