The 4th root of 256 is 4
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0.0625 has a grand total of 2 square roots, and they're both real. They are +0.25 and -0.25
.06 and .06
( +0.063246 ) and ( -0.063246 ).These numbers are rounded.These are the only square roots of 0.004. There are no more real ones,and no imaginary or complex ones.
sqrt(0.0004) = +/- 0.02. Try calculating (+0.02)^2 and (-0.02)^2 by hand to convince yourself that both are real roots of 0.0004. ================
To any set that contains it! It belongs to {-3}, or {45, sqrt(2), -3, pi, -3/7}, or all whole numbers between -43 and 53, or multiples of 3, or integers, or rational numbers, or real numbers, or complex numbers, or square roots of 9, of fourth roots of 81, etc.