1.  Write two additional statements to describe situations in which opposite quantities combine to equal zero ?  2.   Explain why subtracting a positive number is the same as adding its inverse?

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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The following statements describe situations in which opposite quantities combine to equal zero.
  • The temperature at the start of a football game was twenty degrees above zero. During the game, the temperature dropped twenty degrees.

  • A football fan had $80 to spend. He spent $10 to park his car, $60 for tickets to the game, and $10 for some snacks during the game.

  • The home team gained 5 yards on the opening play. On the next play, the team had a loss of 5 yards.              1.  Write two additional statements to describe situations in which opposite quantities combine to equal zero ?  2.   Explain why subtracting a positive number is the same as adding its inverse?
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