Watch this video:
This video shows the basics of pictures and resolution.
Answer these questions:
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