In the problem, assume that the data can be modeled by a straight line and that the trend continues indefinitely. Use two data points to find such a line and then answer the question.
Business As in Exercise 7, Forrester Research estimated $9.9 billion in sales of music and videos online in 2007 and $15.6 billion in 2010. Let x = 0 correspond to 2007, and estimate the online sales of music and video in 2012.
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