The following formulas give the populations (in 1000s) of

Chapter , Problem 4.2.1

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The following formulas give the populations (in 1000s) of four different cities, , , , and , where is in years. Which are changing exponentially? Describe in words how each of these populations is changing over time. Graph those that are exponential. = 200 + 1.3, = 270(1.021) , = 150(1.045) , = 600(0.978) .

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