Is My Procedure Correct for Charge Density and Electric Field?

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


Homework Statement

- blue color on the picture

Homework Equations

- black color on the picture

The Attempt at a Solution

- black color on the picture



http://img511.imageshack.us/img511/5962/cdensity.jpg
 
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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)
 
Thank you very much!
 
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