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Courtney.soden Group Title

The formula P=0.64x^2-0.049+2 models the approx population P, in thousands, for a species of fish in a local pond, x yrs after 1997. During what yr will the population reach 42,568??? 2004,2005,2006, or 2007

  • 2 years ago
  • 2 years ago

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  1. sasogeek Group Title
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    put P=42,568 and solve for x, and then add x to 1997 to find the answer

    • 2 years ago
  2. Courtney.soden Group Title
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    So solve for P first than add x to 42,568?

    • 2 years ago
  3. sasogeek Group Title
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    noo, the population is equalto 42,568 in a certain year, that's what we want to find... that year. to get that year, we know that x is the number of years after 1997 for which the population will be equal to 42,568... so we find x and add it to 1997 and voila, we know the year. :) is that making any sense so far?

    • 2 years ago
  4. Courtney.soden Group Title
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    so 42,568=0.64x^2-0.049x+2 is the equation right? I think thats what I understood by what you just wrote

    • 2 years ago
  5. sasogeek Group Title
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    exactly... then we find x

    • 2 years ago
  6. Courtney.soden Group Title
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    I got x as 42,29,and -29

    • 2 years ago
  7. satellite73 Group Title
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    no that is not the right equation i don't think, because it gives the population in thousands

    • 2 years ago
  8. Courtney.soden Group Title
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    Well Mr. Satellite73 help plz [=

    • 2 years ago
  9. satellite73 Group Title
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    try this one \[ 42.568 = 0.64 x^2-0.049+2\]

    • 2 years ago
  10. satellite73 Group Title
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    http://www.wolframalpha.com/input/?i=42.568%3D0.64x%5E2-0.049%2B2

    • 2 years ago
  11. satellite73 Group Title
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    looks like the answer is closest to x = 8 so 8 years after 1997

    • 2 years ago
  12. satellite73 Group Title
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    aka 2005

    • 2 years ago
  13. Courtney.soden Group Title
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    Thank you [=

    • 2 years ago
  14. sasogeek Group Title
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    I think she missed the x after the 0.049 in her original question cos i noticed she wrote that in her reply.... so that makes it a quadratic, but i could be wrong

    • 2 years ago
  15. Courtney.soden Group Title
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    Yeah I missed the x after -0.049x

    • 2 years ago
  16. sasogeek Group Title
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    and btw why did u write 42.568 <<< and not 42,568 ?

    • 2 years ago
  17. satellite73 Group Title
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    because it says it gives the answer in thousands so if you get P = 4 that means 4,000

    • 2 years ago
  18. satellite73 Group Title
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    the answer appears to be 8 i redid it http://www.wolframalpha.com/input/?i=42.568%3D0.64x%5E2-0.049x%2B2

    • 2 years ago
  19. sasogeek Group Title
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    yeah it is, i solved it and it's approximately 8 so yeah :)

    • 2 years ago
  20. satellite73 Group Title
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    wolfram says 8 when i redid it

    • 2 years ago
  21. Courtney.soden Group Title
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    Gracias you guys I loved the help

    • 2 years ago
  22. sasogeek Group Title
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    anytime :)

    • 2 years ago
  23. satellite73 Group Title
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    yw

    • 2 years ago
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