MODELING REAL LIFE In 2014, there were about 7 billion cell phone subscribers in the world. During the next 5 years, the number of cell phone subscribers increased by about 3% each year. a. Write an exponential model that represents the number of cell phone subscribers y (in billions) t years after 2014. y = Estimate the number of cell phone subscribers in 2019. About 8 billion subscribers. b. Estimate when the number of cell phone subscribers was about 7.5 billion. The number of subscribers was about 7.5 billion in 2016

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