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## Homework Statement

The population of a country is growing exponentially. The population in millions was 120 in 1970 and 150 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?

## Homework Equations

## The Attempt at a Solution

I don't know how to start the equation, so I listed out the years and the populations to no avail.