1. The problem statement, all variables and given/known data Find R_AB in the network. Look at attached file "Problem" 2. Relevant equations R_S= R1+R2+R3+....Rn (for series resistors) 1/RP= 1/R1 + 1/R2 + 1/R3 + 1/Rn.... (for parallel resistors) V=IR (ohm's law) 3. The attempt at a solution Look at attached file "Problem Attempt" I know I'm probably not looking at these circuits the correct way, because each time I try to solve these problems, I find different equivalent resistances depending on the order by which I use the series resistor and parallel resistor formula. I really want to know the correct way to read the diagram, because that is half the battle, and it would guide my calculations a lot more smoothly. I'm also stuck. What do I do with that 9ohms?