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For example:

  • If having cash is a positive number, having a debt is a negative number (you are worse of than if you simply don't have anything).
  • Similarly, gaining a profit on a transaction is positive; losing money is a "negative profit". The same can be said for the mathematical expectation (expectation value) of any activity, bet, game, etc.
  • Altitude above sea level can be called positive, below sea level, negative.
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Q: How are negative numbers used in real life?
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