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A grocery clerk sets up a display of 12-pack cartons of cola. There are 15 cartons at the base of a triangle and one at the top. How many cartons of cola are needed for the complete display. 

9. Use a calculator to evaluate the series   

10. Use graphing technology to approximate the solutions of the equation   to the nearest tenth.
x = _______________ and  _______________ 
 
      Solve the system.
11.   

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