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Friday, February 26 Announcements WeBWorK #7 is now open Due Wednesday, March 2 at 9pm Covers material from “Week 7”—see syllabus online Quiz #3 solutions online; papers in Math Learning Centre Quiz #3 grades: Our section’s average 3/10. Quiz was longer than it should have been; but I still wish we were doing better. Problem #1 (sin-cos trig integral) should be a gimme. Term marks scaled, so if we do well on the final, scores will come up. Just make sure we learn from our mistakes! If you think yours wasn’t graded right: check online marking scheme first. Then hand me official “regrade form” (quizzes web page) with your quiz paper, by next Friday. Friday, February 26 Clicker Questions Clicker Question 1 A massive undertaking A lamina with density ρ = 4 is in the shape of the region between the graphs of y = 1/x and y = (3 − x)/2. Find the mass of the lamina. A. 3 − 4 ln 2 The calcuation B. ln 2 − 3/4 Setting the two functions equal, we find that the graphs intersect at x = 1 and x = 2. So the mass is Z 2 3−x 1 4 − dx. 2 x 1 C. 3/4 − ln 2 D. 4 ln 2 − 3 E. none of the above