negative 8
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The number 8 is not a set and so cannot have any subsets. The set consisting of the number 8 is a set and, since it has only one element in it, it has two subsets: itself and the null set.
-7/8 is a real number.
Yes, 8 is a real number. All positive and negative numbers and zero are classified as real numbers.
8.. if you count the empty subset
A positive number is any number above zero. A negative number is any number below zero. Zero is not a positive or a negative number. A number's opposite is just the negative. For example: 8's opposite is -8 (negative 8). Hope this helped!