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November 1st, 2012, 10:39 AM   #1
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a few problems I'm stuck on

Hello,

I attached four jpg files to this post, it is screenshots of problems I had on a quiz last week. I could really use some help understanding how to work them. Some of them I answered correctly because of solutions I found online but could not really understand them I have a test Monday so I'll be doing this all weekend most likely.

Thanks.
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File Type: jpg math2.jpg (101.0 KB, 62 views)
File Type: jpg math3.jpg (39.5 KB, 62 views)
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November 2nd, 2012, 02:45 AM   #2
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Re: a few problems I'm stuck on

I'll work the first one:

The perimeter of the enclosed area is:



The area is:



From the perimeter, we find:



Hence:



Equating the derivative to zero, we find:



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November 2nd, 2012, 09:50 PM   #3
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Re: a few problems I'm stuck on

Here is the last one. The area of the rectangle will be:

where





Hence:

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November 3rd, 2012, 12:18 PM   #4
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Re: a few problems I'm stuck on

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