1. The number of cell phone subscribers in millions, is provided by N(t)=6.052(1.378)t, where N is number of subscribers in millions and t is number of years after 1990. Describe how you got answer and why utilized that approach.
a) How many subscribers were there in 2005?
b) When will there be one billion subscribers?
2. The population of the city is estimated by P(t)=5,000e0.012t, where t is number of years after 1980. How fast was population growing in 2002?