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angelwings996 Group Title

You can model the populationof a certain city between the years 1995 and 2000 by the radical function P(x) = 55000 sqrt(x - 1945). Using this model, in what year was the population of that city 275,000? a. 1970 b. 1966 c. 1964 d. 1975

  • one year ago
  • one year ago

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  1. Jonask Group Title
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    \[275000=55000\sqrt{x-1945}\] calc x

    • one year ago
  2. angelwings996 Group Title
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    Would I subtract 55000 from 275,000?

    • one year ago
  3. Jonask Group Title
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    no divide both sides by 55000

    • one year ago
  4. Goten77 Group Title
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    |dw:1357766515232:dw|

    • one year ago
  5. chphiranya Group Title
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    Do u know the 'BODMAS' concept ?

    • one year ago
  6. angelwings996 Group Title
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    so \[5 = \sqrt{x-1945}\]

    • one year ago
  7. angelwings996 Group Title
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    No, I only know PEMDAS

    • one year ago
  8. chphiranya Group Title
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    The 'BODMAS' concept tells u the order u should follow when simplifying. The order is from top to bottom. B= Brackets ( ) O= Of D= Divide M= Multiplication A= Addition S= Substraction

    • one year ago
  9. angelwings996 Group Title
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    Okay, but if there is a square root sign, like this one, then how do I know what to do?

    • one year ago
  10. Goten77 Group Title
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    square each side now

    • one year ago
  11. angelwings996 Group Title
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    \[5^{2} = (x-1945)^{2}\] right ?

    • one year ago
  12. angelwings996 Group Title
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    so \[25 = x - 1945 ?\]

    • one year ago
  13. Goten77 Group Title
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    no... squaring the ride side gets rid of the square root

    • one year ago
  14. Goten77 Group Title
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    well yes 25=x-1945 *u had it written different 1 comment b4*

    • one year ago
  15. angelwings996 Group Title
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    Oh sorry, then would I add 1945 to 25 and then it will give me x ?

    • one year ago
  16. angelwings996 Group Title
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    So x = 1970 ? so the answer would be A ?

    • one year ago
  17. Goten77 Group Title
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    yes

    • one year ago
  18. angelwings996 Group Title
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    Okay thanks for your help! (:

    • one year ago
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