In 2011 online sales were $192 billion, and in 2014 they were $249 billion. (a) Find a

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In 2011 online sales were $192 billion, and in 2014 they were $249 billion.

(a) Find a linear function S that models these data. Write S (x) in slope-intercept form. 

(b) Interpret the slope of the graph of S. 

(c) Determine when online sales were $230 billion.

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