1. The problem statement, all variables and given/known data In Fig. 27-29, R1 = 85.8 Ω, R2 = R3 = 67.5 Ω, R4 = 89.7 Ω, and the ideal battery has emf ε = 6.0 V. (a) What is the equivalent resistance? What is i in (b) resistance 1, (c) resistance 2, (d) resistance 3, and (e) resistance 4? 2. Relevant equations I in = I out 3. The attempt at a solution I don't even know where to begin with this problem. I can't figure out how to use the formula of I in = I out with this problem.