Between 1996 and 2004, number of subscribers to cell-phone plans grown about exponentially. In 1996 there were 42,852,000 subscribers and in 2004 there were 166,006,000. It deals with functions of form, where k is continuous exponential growth rate.
(a) Find continuous growth rate of number of cell-phone subscribers?
(b) Find in what year were there 80,000,000 cell-phone subscribers?
(c) Suppose that this rate continues, in what year will there be 400,000,000 subscribers?