Exercise 7: One can approximate population growth via an exponential growth function like f(t) = Cekt. (a) The population of the world was about 6127 in the year 2000, and 6520 in the year 2005 (in millions of people). Let t be the number of years since 2000, and use these two data points to find C and k in the above formula. (b) Use this function to estimate the world population in the year 2020. The actual value is 7678. How close is the estimate?

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