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The square root of 166 is 12.88409873
That is in its simplest form. You can't simplify sqrt(166) any more then it is. The decimal approximation can be found by (166)^1/2
No because it is a ratio of two integers (that's what "rational" means) 166/100
166
To find two-thirds of 21, you multiply 21 by 2/3, which equals 14. Then, adding 166 to 14 gives you 180. Therefore, 166 plus two-thirds of 21 equals 180.