. U.S. Music Albums Sold In 2007 music sales were 500 million albums and in 2015 sales were 240 million albums. (Source: RIAA.) (a) Find the slope-intercept form for a line passing through the points (2007, 500) and (2015, 240). Þ (b) Interpret the slope of this line. (c) Estimate sales in 2011 and compare them with the true value of 330 million. Did your answer use interpolation or extrapolation?

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