No. Variance is always positive and so the sum of variances must also be positive.
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The additive value is (-2).
The additive opposite is negative 8 (-8) (because the absolute value of negative 8 is 8, or positive 8).
No. Neither the standard deviation nor the variance can ever be negative.
No.
The absolute value is always non-negative. So, the absolute values of zero and positive integers are the same as the numbers. However, the absolute values of negative integers are their additive inverses or additive opposites (or positive equivalents).Thus, for example, abs(-3) = +3