(Modeling) Solve the problem.
Online Holiday Shopping In 2011, online holiday sales were $192 billion, and in 2014, they were $249 billion. (Source: Digital Lifestyles.)
(a) Find a linear function S that models these data, where x is the year.
(b) Interpret the slope of the graph of S.
(c) Predict when online holiday sales might reach $325 billion.
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