Problema Solution
Annual sales of music compact discs (CDs) have declined since 2000. Sales were 942.5 million in 2000, and 384.7 million in 2008
(a) Find a formula for annual sales, , in millions of music CDs, as a linear function of the number of years, , since 2000
Answer provided by our tutors
we have two points: (942.5, 2000) and (384.7, 2008)
let 's' represent annual sales in millions of dollars and 't' represent the number of years since 2000, then using these two points we arrive at:
s = -0.014t + 2013.5