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The population of a country is growing exponentially. The population in millions was 90 in 1970...

The population of a country is growing exponentially. The population in millions was 90 in 1970 and 140 in 1980.

A. What is the population t years after 1970?

B. How long does it take the population to double?

C. When will the population be 400 million?

Math   Calculus   
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