The answer is 2
Without higher level math, this is a little bit tedious. The easiest way to approach the problem is to realize √6 = √3√2 ~= (2)(1) = 2, however, the method to use is as follows:
Let A be some number
A x A = A2 ~= 6
Let A=1: 1 x 1 = 1 < 6
Let A=2: 2 x 2 = 4 < 6
Let A=3: 3 x 3 = 9 > 6
Therefore A must be between 2 and 3, denoted:
2 < x < 3
Test a number in the middle, 2.5:
Let A=2.5: 2.5 x 2.5 = 6.25
6.25 rounds to 6 (and not 7), which means A is closer to 2 than it is to 3.
Therefore √6 ~= 2
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6
2.4494897
It is: 15 and its proper value is 6 times square root of 6
Well the square root of 6 is 2.449... so when rounded to the nearest whole number it would be 2, but that would be a very inaccurate answer you should leave it in the square root form or 2.5 if anything.
They are +/- 6