The answer to your question is 8.9
The answer is: " 5.3 in. " .
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Note:
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√(28 in²) = (√28) in = 5.2915026221291812 in = 5.3 in.
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This problem is not easy but use division and multiplication
12 days
8 / (2/3)
or
it takes 3 days to read 2 chapters so
3 X 4 = 12