Real numbers are all positive numbers except zero.
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no. Because square of zero is neither positive nor negative.
A positive number is greater than zero; a negative number is less than zero.
No. Zero is neither positive nor negative, by definition. A positive number is greater than zero. A negative number is less than zero. Although, zero is a non-negative number (a set that includes all positive numbers and zero).
No. Zero is neither negative nor positive.
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!