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) Fmd R(0), R(3), and R(5) and explain what each value represents.

(b) Fmd r = R(x - 5).

(c) Fmd 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?