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The number of asthma sufferers in the world was about 83 million in 1990 and has...

The number of asthma sufferers in the world was about 83 million in 1990 and has been increasing over the years at an approximate rate of 7% per year. Let N represent the number of asthma sufferers, in millions, worldwide t years after 1990.

a) what is the yearly growth or decay factor. (answer complete sentence)

b) write an exponential model to represent the number of asthma sufferers worldwide, N(t), in millions, as a function of t years since 1990.

c) In what year will the number of asthma sufferers reach 200 million? (solve equation algebraically using logarithms, round to two decimals)

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