Electrical Engineering

https://sites.google.com/a/eng.ucsd.edu/ece-45—w2014/home/file-cabinet-1/Homework_No._2.pdf?attredirects=0&d=1

The Homework is on that link.. Please explain the main steps carefully and neatly, so I can understand it.
Also, he randomely picks only one question to grade  – so make sure that each problem is done 100% correctly! I am a poor college student, paying for housing  + everything else so I cannot pay much.

Please help me.