Sounds like you should have started on your homework assignment much earlier.
1. Print the document
2. Place the printed document on a scanner bed
3. Launch a graphics application with scanning capability (Photoshop, Gimp, etc.)
4. Scan the document
5. Save the resulting scan as *.jpg
Or ~ you can just press "Print Screen" when you are viewing the document then open Paint (Programs > Accessories > Paint) and press edit > Paste then save the file as a jpeg (after adjusting the image if necessary).