Answer:
The absolute value or modulus of a real number x (denoted by |x| ) , is the non-negative value of x without regard to its sign.
3) |0| = 0
6) |-7| - |4|
=> 7 - 4 = 3
9) - | -101 | = -101
12) |8| - |-7|
=> 8 - 7 = 1
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