Sales of camera phones camera phones virtually nonexistent

Question

Question: SALES OF CAMERA PHONES Camera phones, virtually nonexistent a few years ago, are quickly gaining in popularity. The function

N(t) = 8.125t² + 24.625t + 18.375          (0 ≤ t ≤ 3)

Gives the projected worldwide shipments of camera phones (in millions of units) in year t, with t 0 corresponding to 2002 .

a. Find N'(t). What does this say about the sales of camera phones between 2002 and 2005?

b. Find N"(t). What does this say about the rate of the rate of sales of camera phones between 2002 and 2005?