No, they can belong to infinitely many subsets.
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The subset consisting of the one number, 7.5 : {7.5}
There are infiitelt many subsets of irrational numbers. One possible subset is the set of all positive irrational numbers.
A set with only one element in it. The only proper subset of such a set is the null set.
It belongs to the set of prime numbers because it has only two factors which are itself and one.
By: Tedd Mikhail Ulit ( sori yan lang po yung nasa libro eh :)) The line, itself, is a subset (though not a proper subset). A ray is a subset of a line with one end-point which extends in only one direction. A line segment is a subset of a line with two end points. A point is a subset of a line. Finally, nothing is a subset (the null subset) of a line.