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A negative number. For example: -I -2 I = -2 because -2= 2 and the opposite of 2 is -2.
The number '8'
-4.7.
The [multiplicative] opposite of -2 is -0.5, which is negative.
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.