27x3 normally means 27 times 3 (which is 81) with a square root of 9. If you mean x to represent a missing number or group of numbers, then you have things like 271593 and there is no straightforward general formula for the square root of things like that.
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No. It is defined to be the positive square root of ((the sum squared deviation divided by (the number of observations less one))
No. There is no real number which multiplied by itself forms a negative number.A negative times a negative is a positive, and only a positive times a negative is a negative.However, in calculus there is an "imaginary value" (called i ) which represents the square root of -1.Square roots of larger negative numbers are represented by the square of the absolute value times i .
There must be some value otherwise nobody would do them. On that basis, the value must be positive.
It is the square of the original number. If the original number represents a length, then the square of the original number represents an area of a square with side equal to the original number.
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