1. The problem statement, all variables and given/known data attached 2. Relevant equations 3. The attempt at a solution The first two were pretty simple, but I'm having trouble grasping why my guess for #3 was actually correct. Why are we ignoring the parallel battery/resistor combo up top and just adding the voltages of the two batteries in series? As I understand it, batteries in series do add voltages, so I get that, I just don't understand why that other battery/resistor has no effect.