U.S. Music Sales In 1999 music sales from vinyl, CDs, and downloads were $15 billion and in 2013 they were $9 billion. (Source: RIAA.)
(a) Find the point-slope form for a line passing through the points (1999, 15) and (2013, 9).
(b) Interpret the slope of this line.
(c) Estimate sales in 2008 and compare them with the true value of $10.4 billion. Did your answer use interpolation or extrapolation?
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