SOLUTION: my teacher told me that we have to find a support for why absolute value isnt always positive.

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The absolute value of a real number n can be written as |n| and can be defined as follows:

If n is greater than or equal to zero, then the absolute value of n, written
|n| = n.
If n is less than zero, then the absolute value of n, written |n| = -n.


SAMPLE A
|-7/2| = -(-7/2) = 7/2

SAMPLE B

|π - 6| = -(π - 6) = -π + 6

Do you see how one absolute value answer is positive and the other is negative?