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.
Estimate the number of cell phone subscribers in 2008. Round your answer to the nearest tenth.
3
about_million subscribers
b. Estimate the year when the number of cell phone subscribers was about 278 million Round your answer to the nearest whole year.
The number of subscribers was about 278 million in
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