Edit the file whose name matches your e-mail address. Do not edit other files in this repository. Add your answer in the file where you see "Write your answer here."
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Typeset the document by typing: pdflatex qa315-09oct2015.tex Type this command twice. The program needs to read through your document twice to build the table of contents.
View your typeset document by typing: evince qa315-09oct2015.pdf &
Add and commit to your local repository. Then push to your GitHub repository. Finally, send a pull request to me.
Read about "syncing with a fork" on the Web to learn how to keep your copy of this repository up-to-date with my copy.