Math-Population Word Problem

The population of rabbits in a national forest is modeled by the formula P=8,600+650 ln(t+1) where "t" is the number of years from the present.
a)How many rabbits are now in the forest
b)Estimate when it will take for the number of rabbits to reach 12,000?
c)Estimate how many rabbits there will be 50 years from now
d)Estimate how many rabbits there will be in 100 years from now.
Please show as much work as possible.

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asked by Jake
  1. at "present time" t = 0
    P = 8600 + 650(ln(1), but ln1 = 0
    = 8600

    b) 8600 + 650 ln(t+1) = 12000
    ln(t+1) = 5.23077
    t + 1 = e^5.23077 = 186.9
    t = 185.9 years ???? (my math is correct)

    c) plug in 50 for t, evaluate
    (I got 11,156)

    d) same as c, plug in t = 100

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    posted by Reiny
  2. thank you very much, it all makes sense now except for a. could you explain how you get that number. I plugged it into a calculator and it is correct but i just don't understand how it works.

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    posted by Jake
  3. a )

    Now t = 0

    8,600 + 650 ln( t + 1 ) =

    8,600 + 650 ln( 0 + 1 )=

    8,600 + 650 ln ( 1 ) =

    8,600 + 650 * 0 =

    8,600 + 0 = 8,600


    b )

    8,600 + 650 ln( t + 1 ) = 12,000

    650 ln( t + 1 ) = 12,000 - 8,600

    650 ln( t + 1 ) = 3,400

    ln( t + 1 )= 3,400 / 650

    ln( t + 1 )= 5.23076923

    t + 1 = e ^ 5.23076923

    t + 1 = 186.93655

    t = 186.93655 - 1 = 185.93655


    c )

    8,600 + 650 ln( 50 + 1 ) =

    8,600 + 650 ln( 51 ) =

    8,600 + 650 * 3.93182563 =

    8,600 + 2,555.6866595 = 11,155.6866595

    Rounded 11,156


    d )

    8,600 + 650 ln( 100 + 1 ) =

    8,600 + 650 ln( 101 ) =

    8,600 + 650 * 4.61512 =

    8,600 + 2999.828 = 11,599.828

    Rounded 11,600

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    posted by Bosnian
  4. Ohh my gosh, thank you. I was just confused about "a" but the extra information cant hurt. Thank you so much.

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    posted by Jake

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