Watch this video:
Resolution and Pictures from Alvin Trusty on Vimeo.
This video shows the basics of pictures and resolution.
Answer these questions:
https://docs.google.com/document/pub?id=1Ra7l82Lzfnh9xYmyp_lta20P3AW_dPUPYhWeNhRycFA
If you have a google docs / drive account, you can make a copy of this and save it in your documents. Be sure to put your name on it.
Print it and turn it in.
To find out the resolution of your monitor (and see the most popular monitors) click here: http://www.screenresolution.org/year-2013/
You can see current web page trends here: http://www.w3counter.com/globalstats.php