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5 April, 11:27

In 2014, the world's population reached 7.17 billion 1 and was increasing at a rate of 1.1% per year. assume that this growth rate remains constant. (in fact, the growth rate has decreased since 2008.) (a) enter a formula for the world population, p, (in billions) as a function of the number of years, t, since 2014.

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  1. 5 April, 11:30
    0
    Given initial population=Po=7.17 billion

    and rate=r=1.1

    The population is increasing exponentially

    P=poe^rt

    P=7.17e^0.011*t

    After 6 years the population will be is 7.66 billion

    Hence population in 2020 will be 7.66 billion.
  2. 5 April, 11:46
    0
    The formula is:

    P = (population in 2014) x (1+r) ^n

    where: r = rate

    n=number of years

    and to solve using the formula above:

    Population = 7.17 * 1.011^ (2018-2014)

    Population = 7.17 * 1.011^4

    Population = 7.49 Billion (Rounded)

    The question is 1.1% per year

    Example:

    Lets say you start at 1000

    1.1% of 1000 is 11

    Making the next population after 1000 be 1000+11 = 1011
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