The following table shows approx- imate global sales of personal computers in millions of units for selected

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The following table shows approx- imate global sales of personal computers in millions of units for selected years.image


(a) Discuss the general trend in sales during this time period. 


(b) Would a linear function model this data well? What other type of function might work? Explain. 


(c) If a parabola is used to model this data, will it open upward or downward? Explain. 


(d) Model these sales with S(x) = a(x - h)2 + k. 


(e) What data point did you use for the vertex? Explain. 


(f) Estimate sales in 2014. Did your answer involve interpolation or extrapolation?

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