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I'm 52 and have wanted to brush up on my math skills for many years. When I originally found Khan Academy a couple of years ago I thought it was just for kids and I left. About a month ago I return...

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This is the math question: (-3)³ - 4²   The answer is -43 but I don't understand why it isn't -11. Is it a mistake? I would understand -43 being correct if it said:  - -4² but it doesn't. I would ...