Digital Music Revenues The total projected worldwide digital music revenues R, in millions of dollars, for the years 2012 through 2017 can be estimated by the function
R(x) = 28.6x2 + 300x + 4843
where x is the number of years after 2012.
(a) Find R(0), R(3), and R(5) and explain what each value represents.
(b) Find r(x) = R(x − 2).
(c) Find r(2), r(5), and r(7) and explain what each value represents.
(d) In the model r = r(x), what does x represent?
(e) Would there be an advantage in using the model r when estimating the projected revenues for a given year instead of the model R ?
Source IFPI Digital Music Report 2013
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