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QUESTION
What is ##abs(-9)##?
##abs(-9) = 9##
If ##x > 0## then ##abs(x) = x > 0##
If ##x = 0## then ##abs(x) = 0##
If ##x < 0## then ##abs(x) = -x > 0##
For all ##x## we have ##abs(x) >= 0##
##abs(x)## is the 'size' of ##x##, regardless of its sign.
Equivalently, it is the distance of ##x## from ##0##
