9.4, due February 11

Ok, so the resounding question from this section was "What?" For some reason I had to read this section twice before any of it clicked.  The first time through things just didn't make sense.  I was switching equalities (especially the addition formula) in my mind so as I read the proofs everything was out of control.  I thought it was really cool (after I could make sense of it) that we used fields to prove the addition and multiplication of fractions.  I had done that in one of my education classes with diagrams and now I can do it arithmetically. Neat!