What is the solution to part a of Density physics homework?

[eloiamb]

Here is the question.
http://i72.photobucket.com/albums/i195/eloiamb/2011-04-2995015008.jpg

Here is my solution to part a.
http://i72.photobucket.com/albums/i195/eloiamb/physics.jpg

I feel pretty confident but, some reassurance would be great. Maybe I'm just thinking to complicated but something is throwing me.

Thank you!

 

[Sethric]

Looks correct to me. Even the correct density for copper.

 

[eloiamb]

Thanks for the quick response.^^