1. The problem statement, all variables and given/known data Find the open circuit voltage V0, short circuit current ISC, and RTH, 2. Relevant equations 3. The attempt at a solution I found the equivalent resistance to be 20 ohms(just by combining resistors in parallel and series) and V0 to be 30V, which I think might be wrong. I did a nodal analysis at VA : (VA-30)/10 + (VA)/15 +(VA)/30 =0 VA=10V ISC=(VA)/30 ISC=0.33A Then I found RTH =30v/0.33A=90 ohms Shouldn't my RTH = Req? I'm not really sure what I did wrong.