Any set that contains it, for example, the set {1, 4/7, sqrt(5), -99}
sqrt(5) is an irrational number
which form a subset of real numbers
which form a subset of complex numbers
which ...
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Irrational Numbers which are a subset of Real Numbers which are a subset of Complex Numbers ...
The rational numbers, the real numbers and sets of higher order which contain the reals such as the complex numbers.
To any set that contains it! It belongs to {sqrt(30)}, or {45, sqrt(30), pi, -3/7}, or irrational numbers, or real numbers between -6 and 6, or all real numbers or complex numbers, etc.
In math joint sets are contain at least one element in common. An example of joint sets are {1,3,8,4} and {3,9,1,7}.
Two sets are equal if they both contain the same elements.