The calc problem has defeated me. Why can I no longer calculate the Riemann sum of (Xi)^2 * (Xi - X(i-1))? Honestly, I used to be able to do Riemann sums, but I've forgotten, and though I worked on that single problem for more than four hours today, my end calculations were obviously wrong. Tomorrow I guess I'll find out Professor Sanerib's grading style -I chose to show all my work and my best incorrect answer, rather than just copy from the back- and hopefully survive the quiz.

In the meantime, I need my rest, so goodnight. I'm sure you never got through yesterday's post anyways.