Friday, March 11 Announcements WeBWorK #9 is now open Due Wednesday, March 16 at 9pm Covers material from “Week 9”—see syllabus online Quiz #4 solutions online; papers in Math Learning Centre Quiz #4 grades: Our section’s average was 3.4/10. We really did poorly on #3 (error bounds for approximations to integrals). Definitely worth making sure we understand how to do such problems. 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, March 11 Clicker Questions Clicker Question 1 Practicing the Comparison Test Determine the convergence or divergence of these two series: ∞ ∞ X X 6n n I. II. 5n − 4n n2 − n + 4 n=1 A. I. diverges but II. converges B. both I. and II. diverge C. both I. and II. converge D. I. converges but II. diverges n=1 Series to compare to n 6n 6n 6 I. n > n = , and the n 5 −4 5 5 ∞ n X 6 geometric series diverges. 5 n=1 n n 1 > 2 = when n ≥ 5, n2 − n + 4 n n ∞ X 1 and the harmonic series n n=5 diverges. II.