It is uncountably infinite.
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-5 to a set number is -5
not a real number * * * * * Zero is very much a real number. In fact it is the additive identity for the set of real numbers.
100 is an element in the real number system. It is a member of the set of real numbers.
Wrong! Not only is zero a real number, but it is the additive identity for the set of integers, rational numbers as well as real numbers.
-29 is an element of the real number system. That is to say, it belongs to the set of real numbers.