Question: I have two problems to solve (one question, 2 parts). I know the answers but I don't understand what math rules/principles I apply. In other
I have two problems to solve (one question, 2 parts). I know the answers but I don't understand what math rules/principles I apply. In other words I need help getting through the answers. What math do I need to apply/learn. Your help is greatly appreciated.

PROBlem 1 Let 1 81
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