It is -10/9
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The square root of 100 is 10 but positive and a negative is a negative so it is negative 10
Yes it is.
The square root of any negative number is i times the square root of the corresponding positive number. In this case, 10i.
The square root of 100 is 10
Both of those numbers are perfect squares, so square root each number separately and you will get your answer.√(81/100) = √81 / √100 = 9/10 = 0.9Don't know how far you've progressed as technically the answer is ± 0.9, but you may not have reached the stage of dealing with negative square roots of positive numbers.