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I'm having some trouble understanding some parts of this question

This is what I've been doing but I'm not quite sure why it works:

I have some similar problems and have been getting the same problems with them. I don't know why the line current equals I(eff) and line voltage equals V(eff). Also why does V(an) = V(aA)+V(AN).

This is what I've been doing but I'm not quite sure why it works:

I have some similar problems and have been getting the same problems with them. I don't know why the line current equals I(eff) and line voltage equals V(eff). Also why does V(an) = V(aA)+V(AN).