Is My Procedure Correct for Charge Density and Electric Field?

[xz5x]

Is my procedure/result correct? Are these equations relevant for the problem? Many thanks!

Homework Statement

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Homework Equations

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The Attempt at a Solution

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http://img511.imageshack.us/img511/5962/cdensity.jpg

 

[diazona]

Your procedure looks right, so I'd expect that the answer should be right as well. (I don't know offhand what it's supposed to be, of course)

 

[xz5x]

Thank you very much!