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2 October, 07:22

Estimate the number of cell phone subscribers in 2008. Round to the nearest tenth.

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  1. 2 October, 08:42
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    For this case we have an exponential function of the form:

    Where,

    A: initial number of subscribers

    b: rate of change

    x: number of years

    Part A:

    The equation modeling the problem is given by:

    For the year 2008 we have x = 2.

    Substituting values:

    Part B:

    For the year in which the company reaches 278 million we have

    Thus, the company reaches 278 million in the year 2009.
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