I participated in a math competition but I did not do very good. Does anybody have some tips?

Answer for 10 points show work you guys in advanced < 3

What is the solution to the equation e3x=12? round your answer to the nearest hundredth

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.