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Read the Math Notes box in this lesson.  Then evaluate each expression below. 

  1.   for 

    Rewrite the expression, substituting in the known variable.

  2.   for 

    See part (a) for a strategy to evaluate this expression. Remember to pay attention to negative signs.

  3. for 

  4.   for 

    Refer to parts (a) and (c).

  5.   for 

    Rewrite the problem, substituting in the known variable and then solve.