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IMAS 2013 Junior Division First Round Question 5

IMAS · IMAS 2013 Junior Division First Round

Question 5

If $x$ is a real number, which of the following is an accurate description of the expression $|x|-x$?
  1. must be positive
  2. may be positive or zero
  3. must be negative
  4. may be negative or zero
  5. may be any number