1. The problem statement, all variables and given/known data Problem: What single, equivalent resistor could replace all of the resistors in this circuit? Given R1 = 4, R2 = 5, R3 = 14, R4 = 9 2. Relevant equations In series, R1 + R2... = Req Parallel, 1/R1 + 1/R2... = 1/Req 3. The attempt at a solution I have tried multiple different possibilities of series/parallel. I thought for sure that R2/R4 are in parallel, that R1 was in series with 2/4 and that R3 was in parallel with 1/2/4. When I tried this answer, I got feedback that I was wrong.