The answer to question #1 is 11:
√x² = √121
√x² = x
√121 = 11
So the answer is x = 11.
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For the second question, I don't know what the exact answer is, but I do know that it is one of the options with 8/3. I can't figure this out because I don't know how to do √x³. Here was the work that I did do:
√64 8 Based on this, I would say the answer has to be positive 8/3.
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√27 3√3