The number of cell phones recycled or refurbished instead of being sent to landfills is increasing by about 30% per year since 2004. In 2008, 5.5 million cell phones were recycled or refurbished.
(a) Find an exponential model for the situation described above.
(b) according to your model, how many cell phones were recycled or refurbished in the year 2004?
(c) Why did you choose your input the way you did in part (a)?