Clarify the Ch 21 reading assignment
Answered the first question. Also I don't think the book answered the question.
Added the second question
Added answers to 3, need a few more, corrected question prompt
Added answers for 4 and 5
added 6-9 answers on 3
added answer to 4
Added answers to 5
added the last 2 answers
Merge pull request #5 from aczirkle/master

Zirkleac pull request