(adsbygoogle = window.adsbygoogle || []).push({}); Find total Power absorbed or delivered to Element "B".

I'm supposed to find how much power was absorbed or delivered by element "B". What is the thought process/solving technique for this type of problem? This was a quiz problem, it has already came and gone; if I see a problem like this again please help me in knowing how to solve this type of problem and how I might apply that knowledge to other similar problems with different questions. In other words, I'd like to understand it all completely. Please see my attachment. Thanks for any help given or offered!

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# Homework Help: Find total Power absorbed or delivered to Element B .

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