2.34
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sqrt(8640) = 92.95 (to 2 dp)
+ or - 23.152 to 3 dp. And it is square root, not route.
sqrt(7) = ±2.65 (to 2 dp)
sqrt(126) = 11.22 (to 2 dp).
Power of 0.5 is the same as square root. So, 20.5 = sqrt(2) = 1.4142 (to 4 dp).