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10-30.

Simplify each expression.  

  1.  

    First, simplify the numbers within the absolute value symbols.

    Remove the absolute value symbols and the resulting answer must be a positive number.

  1.  

    See part (a).

  1.  

  1.  

    Use the rules you learned about absolute value to simplify this expression.

  1.  

    See part (a).

  1.  

    See part (a).