In the set of problem, assume that the data can be modeted by a straight line and that the trend continues indefinitely. Use two data points to find such a line and then answer the question. (See Example 1.)
Business As in Exercise 1, 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.
Exercise 1
Business Forrester Research, Inc., estimated the amount of online retail sales to be $132.1 billion in 2006 and $271.1 billion in 2011.† Let x = 0 correspond to 2006, and estimate the amount of online retail sales in 2010.
†Forrester Research, Inc., U.S. eCommerce: Five Year Forecast and Data Overview. (Cambridge, MA: 2006).
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