The number of U.S. broadband Internet households (in millions) between the beginning of 2004 (t = 0) and the beginning of 2008 (t = 4) is approximated by f(t) = 6.6t + 33 (0 ≤ t ≤ 4). Over the same period, the number of U.S. dial-up Internet households (in millions) is approximated by g(t) = −3.4t + 40.5 (0 ≤ t ≤ 4).