1. The problem statement, all variables and given/known data http://img440.imageshack.us/img440/9996/untitledbq0.png [Broken] 2. Relevant equations Please see picture. 3. The attempt at a solution Please see picture. --- I have a strong feeling this is incorrect. I think I'm missing something important here... I don't know what R1 is, so I'm a little lost.