Digital Music Revenues The total projected worldwide digital music revenues R, in millions of dollars, for the years 2005 through 2010 can be estimated by the function
R(x) = 170.7x2 + 1373x + 1080
where x is the number of years after 2005.
(a) Find R(0), R(3), and R(5) and explain what each value represents.
(b) Find r = R(x − 5).
(c) Find r(5), r(8), and r(10) and explain what each value represents.
(d) In the model r, 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: eMarketer.com, May 2006
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