{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

q207k

# q207k - Quiz II and Key MAC 2312 S Hudson 1[30 points Find...

This preview shows page 1. Sign up to view the full content.

Quiz II and Key July 19, 2007 MAC 2312 S Hudson 1) [30 points] Find the average value of f ( x ) = sec( x ) tan( x ) on the interval [0 , π/ 3]. 2) [40 points] Find the volume of the solid that results when this region is revolved around the y -axis; y = x 2 - 1, x = 2 and y = 0. 3) [30 points] Evaluate the integral using integration by parts: x e 3 x dx . Remarks and Answers: The average grade was about 66/100. The scale for Quiz 2 is: A’s = 80-100, B’s 70-79, etc. Since the drop date is next week, I’ve also computed a semester average for each student, based on the 2 quiz grades and Exam 1. HW will be included later. The average of the averages is approx 75/100. This is a little higher than for Exam I, mainly because averages below 50 are not included. The current scale for your semester average is: A’s 85-100, B’s 75-84, C’s 65-74, etc. I wrote your average and letter grade in the upper right corner of your Quiz 2. 1) 3 . This was exercise 7.6.6. Many people forgot that sec( x ) tan( x ) dx = sec( x ) + C . Or that sec( π/ 3) - sec(0) = 2 - 1 = 1. 2) 9 π/ 2. This was exercise 7.2.20 in the disk/washer chapter, but it’s easier with shells.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}