We started class by talking about our due dates for our DEVELOPING EXPERT VOICES assignment. Remember guys: you can always move your due date earlier than expected. We also talked about the rubric for this assignment. Remember that changes must be made no later than Friday, March 23rd.

Let's get the math started...

To solve for

**a**you simply plug in 1 for k. To solve for

**b**,

**c**, and

**d**, you must integrate it from 1 to the number of items. We start with 1, because this is where the domain of the function begins. If you plugged 0 into the function, you would get 23 minutes.

*This doesn't make sense; it shouldn't take 23 minutes to make nothing*. Once you know the integral, the rest is just punching it into the calculator. The answers can be found on the bottom of this page. http://3.bp.blogspot.com/_tlF3qs3v9cw/RfmQ9vFtnUI/AAAAAAAAAIA/ymR08nIwBLc/s1600-h/AppsOfTheIntegralExerc.jpg

*Note: This is a good exercise to practise for the unit test.*

With the help of Fooplot http://www.fooplot.com/, we were able to see what the graph looked like. Points of intersection tell you where to integrate.

1. To find the area of S, we simply find the integral from 0 to 4. Because the function

**f(x)**is on the bottom, we subtract it from

**g(x).**

**arbitrary slice**, and find its area. In this case, the shape of the slice is a semi-circle, where the radius is the top function, g(x), subtract the bottom function,

**f(x)**. Once you have the area, you must write the integral. You then apply this integral to find the volume of the whole thing.

a)

b) d) In this case, the solid is rotating around the y-axis, therefore the shape of the arbitrary slice is no longer a circle. It becomes a prism. The width of the prism is the

*. (remember: the paper towel) Its thickness is*

**circumference****, because we want the slice to be infinitesmally small. Its**

*dx**is simply the top function, g(x), subtract the bottom function,*

**height****f(x)**.

So that brings us to the end. If you're still having trouble, the slides from Thursdays class http://www.slideshare.net/gofull/30241/1 are up.. thank goodness for our super-di-duper smartboard!!! **HMWK** for the weekend is **EXC 8.5 # 1,3,5,11,15**. And by the way, MARK is the scribe for Monday! *Enjoy the rest of your weekend guys =)*

## 3 comments:

Great use of images Linger. I am impressed with the detail that they show. Thanks for being a great scribe.

Harbeck

Sargent Park School

Hi Linger,

Your annotations with the clear illustrations are really important to understanding the content. This scribe should be a good one to assist with review.

Best,

Lani

WOO LINGER! that scribe was awesome. i have a better understanding of what we've been talking about. HALL OF FAME! =) and...bonus marks? ;)

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