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Posted by **matt** on Wednesday, December 23, 2009 at 8:01am.

so far i thought i could set up the area equation to be A= 4(x^2) + 4xy and then take the derivative but im not getting the correct answer

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**Vanessa**, Wednesday, December 23, 2009 at 8:14amwhat is the Tenths place

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**Vanessa**, Wednesday, December 23, 2009 at 8:17amwhat is the tenths place?

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**bobpursley**, Wednesday, December 23, 2009 at 8:22amIN the fraction 4.5, the five is in the tenths place.

For matt: I dont understand how a rectangular pen can have a different width n each end.

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**matt**, Wednesday, December 23, 2009 at 8:27amyeah i dont understand the wording but the diagram shows that each end of the entire rectangular pen is 2x

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**Reiny**, Wednesday, December 23, 2009 at 8:28amI could be a matter of interpretation.

It said, "four individual square pens bordered by a rectangular pen of a different width on each end"

You have the rectangles fanning out on one side of the squares. Could it not also mean that they fan out on all sides of the squares, so that there would be 10 rectangles with the squares in the middle?

Just wondering if that is the problem.

Anyway, according you your interpretation, I got

20x + 5y = 100

4x + y = 25

y = 25-4x

for

A = 4x^2 + 5x(25-4x)

expanding this, differentiating and setting that equal to zero, gave me

x = 25/6 ft.

If you also got that, try the different interpretation.

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