Assume the number of U.S. dial-up Internet households stood at 42.5 million at the beginning of 2004 and was projected to decline at the rate of 3.9 million households per year for the next 4 years.

Question

Assume the number of U.S. dial-up Internet households stood at 42.5 million at the beginning of 2004 and was projected to decline at the rate of 3.9 million households per year for the next 4 years.

(a) Find a linear function f giving the projected U.S. dial-up Internet households (in millions) in year t, where t = 0 corresponds to the beginning of 2004.

f(t) = 

 

(b) What is the projected number of U.S. dial-up Internet households at the beginning of 2008?

 million households

Answer 1

f(t) = 42.5 - 3.9t

f(4) = 42.5 - 3.9*4

= 42.5 - 15.6

= 26.9