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Yesterday, 02:21

The population of a certain animal species you are studying decreases at a rate of 3.5% per year. Only 80 of the animals in the habitat remain after 3 years of conducting your research. What was the initial amount of animals?

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  1. Yesterday, 03:00
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    The function:

    f (x) = x * 0.965^t

    where x is the initial amount and t is the number of the years

    80 = x * 0.965^3

    80 = x * 0.89632

    x = 80 : 0.89632 ≈ 89

    Answer:

    The initial amount of animals was 89.
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