Finding the electric field from a charged surface

[oceans93]

Here is the link to the question:
http://s1123.photobucket.com/albums/l545/nanooshi/?action=view&current=mastring_phy.png


I know that I should use the integral for the entire surface, but I don't know how to start or what equations I should use to begin with. Thanks for your help

 

[cupid.callin]

do you knw about gauss law?
you can use that