1. The problem statement, all variables and given/known data imgur link: http://i.imgur.com/G9RKEH1.png 2. Relevant equations 3. The attempt at a solution Should I just consider that A and B are parallel with each voltage source respectively and so therefore that's the voltage drop that they experience individually? The ground terminal should be zero volts, no? Wouldn't that mean the polarity of the bottom voltage source needs to be reversed?