Can someone pls pls help me with the 2 one im struggling with that one. TYSM IF YOU HELP ME!!:)

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Pls what is the decimal equivalent of 5 over 9? select one: a. 0 point 5 bar over top of 5 b. 0 point 6 bar over top of 6 c. 0 point 8 bar over top of 8 d. 0 point 9 bar over top of 9