Chapter 1.4, Problem 18E

DIGITAL VERSUS FILM CAMERAS The sales of digital cameras (in millions of units) in year t is given by the function

$f\left(t\right)=3.05t+6.85\left(0\le t\le 3\right)$

where $t=0$ corresponds to 2001. Over that same period, the sales of film cameras (in millions of units) is given by

$g\left(t\right)=-1.85t+16.58\left(0\le t\le 3\right)$

a. Show that more film cameras than digital cameras were sold in 2001.

b. When did the sales of digital cameras first exceed those of film cameras?

Source: Popular Science.