Chapter 2.5, Problem 86AYU

Digital Music Revenues The total worldwide digital music revenues $R,$ in billions of dollars, for the years $2012$ through $2017$ can be modeled by the function

$R\left(x\right)=0.15x^2-0.03x+5.46$

Where $x$ is the number of years after $2012.$

Find $R\left(0\right),R\left(3\right),$ and $R\left(5\right)$ and explain what each value represents.

Find $r\left(x\right)=R\left(x-2\right).$

Find $r\left(2\right),r\left(5\right),$ and $r\left(7\right)$ and explain what each value represents.

In the model $r=r\left(x\right),$ what does $x$ represents?

Would there be an advantage in using the model $r$ when estimating the projected revenues for a given year instead of the model $R?$