It is zero.
It is zero.
It is zero.
It is zero.
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The answer is 18. Absolute value is the distance from zero. So 18 is the same distance from zero as -18. And minus minus 18 is positive 18, so the answer is still 18.
It may also be zero. This is because of the way the absolute value is defined. The idea is, precisely, to get rid of the minus sign.
The absolute value of zero is zero.
The only number whose absolute value is zero is zero. This is because a number's absolute value is its distance from zero on the number line.
The absolute value of zero is zero. The absolute value of any other real number - or even of any other complex number - is different from zero.