The problem seems quite easy, and it probably is, however i'm having trouble understanding how I can put up an equation to solve this at all considering the examples in the book are like ten thousand times easier than the equation we're given here: http://img292.imageshack.us/img292/7901/circuitxa6.jpg [Broken] I am supposed to find v0, the only problem is, I really don't know what v0 is. The notion used at v0 is different from anything i've seen (And this seems to be the only time it's used in the entire book). If I were to have a guess I'd say it's supposed to indicate there's some kind of voltage divider. However, if that is the case, I can't figure out how to solve the equation considering all the examples in the book only have an R1 and an R2. What I would really like is just a hint to what i'm supposed to do to solve this circuit. I've tried switching around the circuits to make this look more like your standard voltage divider, but to no avail. I've also tried kirkhoff's laws just for the kick of it but there simply doesn't seem to be enough information to go by. So i'm left rather stumped. In general my biggest problem at the moment is defining v0. Any help would be greatly appreciated, as i'm sincerely stuck here.