Corrections to Exam 4 key

Typing up the key late at night was not a good idea... There were a number of errors on page 4 of the Exam 4 key that I posted this morning. If you already looked at the key or printed it out, throw away page 4 and go get a fresh version. Sorry about that. http://www.drbodwin.com/teaching/exams/c210pe4ak.pdf