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anonymous

  • one year ago

Suppose you want to build a deck around your pool with a uniform width on all sides. The pool measures 15 yards by 20 yards. You want to increase the area of the pool to 600 yd2. What is the width of the deck? Approximately 3.6 yards Approximately 4.5 yards Approximately 5.1 yards Approximately 6.7 yards

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  1. anonymous
    • one year ago
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    @Loser66 i am lost..

  2. anonymous
    • one year ago
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    the pool a rectanlge im guessing? and i know that the area of the pool (15*20) is 300, and that it need to be doubled to get 600?

  3. BioHazard9064
    • one year ago
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    Approximately 3.6 yards

  4. anonymous
    • one year ago
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    how? i wanna know please

  5. BioHazard9064
    • one year ago
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    ok

  6. Loser66
    • one year ago
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    |dw:1439749701050:dw|

  7. Loser66
    • one year ago
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    Let's wait for @BioHazard9064

  8. BioHazard9064
    • one year ago
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    (20 + 2X) * (15 + 2X) = 600 300 + 40X + 30X + 4X^2 = 600 300 + 70X + 4X^2 = 600 4X^2 + 70X - 300 = 0

  9. Loser66
    • one year ago
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    Too many guidance will confuse you. :)

  10. BioHazard9064
    • one year ago
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    although I agree drawing a graph would help a lot for a start

  11. anonymous
    • one year ago
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    okay, but how is it 3.6?

  12. BioHazard9064
    • one year ago
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    600 - 300 = 300. We need 300 square yards of deck

  13. BioHazard9064
    • one year ago
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    So if we let x = the width

  14. BioHazard9064
    • one year ago
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    so then you do 300 = 3x^2 + 70x.

  15. BioHazard9064
    • one year ago
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    Then you use it in a quadratic equation with a =4, b=70 and c= -300 to get x = 3.56 so you would round it up to 3.6

  16. BioHazard9064
    • one year ago
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    you understand?

  17. anonymous
    • one year ago
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    yes i do. sorry, was distracted lol

  18. BioHazard9064
    • one year ago
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    Glad to help

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