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11 January, 22:08

A population of 550 rabbits is increasing by 7.5% each year. in about how many years will the population be over 1000?

a) about 5 years

b) about 9 years

c) about 15 years

d) about 7 years

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Answers (1)
  1. 12 January, 02:00
    0
    I believe this would take the form of an exponential equation:

    A = Ao (1 + r) ^t

    where A is final population, Ao is initial population, r is rate of growth and t is time

    A / Ao = (1 + r) ^t

    log A / Ao = t log (1 + r)

    t = (log A / Ao) / log (1 + r)

    t = [log (1000 / 550) ] / log (1.075)

    t = 8.27 years

    SO the answer is B) about 9 years
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