I was able to fix the rear tire rubbing on the frame. All I had to do was readjust the wheel and make sure the nuts were really tight. After that I was able to take it for its first ride in years! Here's what she looked like.
My next step is to clean up my chain and gears and to adjust the derailers.
I started this blog to share my transformation from math nerd to math nerd who loves to share math with young people. I teach high school in Philadelphia, Pennsylvania. Your comments are always welcome.