Math. test tomorrow. help!

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In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time?

The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!

  • Math. test tomorrow. help! -

    see your previous post of the same question.

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