In 2006, there were approximately 233 million cell phone subscribers in the United States. During the next 4 years, the number of cell phone subscribers increased by about 6% each year.
a. Write an exponential growth model giving the number of cell phone subscribers y (in millions) t years after 2006.
the general formula for an exponential growth is: F = P( 1 + i ) ^t where F is the future amount in t years P is the present amount i is the fraction of increase per time t is the time
for the increase cellphone subscriber P = 233 i = 0.06 so F = 233 ( 1 + 0.06)^t F = 233 ( 1.06)^t
