I've been presented with a question, but I am not sure how to approach it: A linear resistor containing two sources drives a 100ohm load resistor. Source #1 delivers 250mW to the load when source #2 is off. Source #2 delivers 4W to the load when source #1 is off. My question is, how would I go about finding the power delivered when both sources are on? I know that the answer isn't 4.25W, because that would just be the sum of the two powers, and disregarding the resistor. Thanks for your help.