1. The problem statement, all variables and given/known data Theres two current sources and three voltages sources the problem wants to know the power supplied by each current source 2. Relevant equations according to the book the problem can be solved using Kirchoffs current law and kirchoffs voltage law The answers according to the textbook the 2mA current source supplies 6mW and the 1 mA current source supplies -7mW 3. The attempt at a solution I can only guess that they subtract the 5v by the 8v then multiply the result by the 2mA. Also subtract the 15v by the 8v and multiply the result by the 1mA source to get the -7mW answer.