keep in mind, absolute values are always positive, even when they say negative.That is because the absolute value of a number is just the distance that number is from 0. Example : -5 and 5...they are both 5 spaces from 0...doesn't matter if it is negative or positive, it is still 5 spaces.
|0| = 0
|10| = 10
|-10| = 10
|-20| = 20
so ur answer is : | -20 |