Chapter 8, Problem 8RE

(a)

To determine

A function that models the sale of digital track y in million, x years after 2004 if 142 million digital tracks was sold in 2004 and the amount increases at an average rate of 219 million digital track per year. Refer to the bar graph provided in the question.

(b)

To determine

To calculate: The year when the digital track sale and album sales are equal and the number of sales of each product in that year if the function that models the number of albums sold is $95x+y=770$ where x is the year after 2004 and y is the number of albums sold.Refer to the bar graph provided in the question.