anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Loser66 i am lost..
anonymous
  • anonymous
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?
BioHazard9064
  • BioHazard9064
Approximately 3.6 yards

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anonymous
  • anonymous
how? i wanna know please
BioHazard9064
  • BioHazard9064
ok
Loser66
  • Loser66
|dw:1439749701050:dw|
Loser66
  • Loser66
Let's wait for @BioHazard9064
BioHazard9064
  • BioHazard9064
(20 + 2X) * (15 + 2X) = 600 300 + 40X + 30X + 4X^2 = 600 300 + 70X + 4X^2 = 600 4X^2 + 70X - 300 = 0
Loser66
  • Loser66
Too many guidance will confuse you. :)
BioHazard9064
  • BioHazard9064
although I agree drawing a graph would help a lot for a start
anonymous
  • anonymous
okay, but how is it 3.6?
BioHazard9064
  • BioHazard9064
600 - 300 = 300. We need 300 square yards of deck
BioHazard9064
  • BioHazard9064
So if we let x = the width
BioHazard9064
  • BioHazard9064
so then you do 300 = 3x^2 + 70x.
BioHazard9064
  • BioHazard9064
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
BioHazard9064
  • BioHazard9064
you understand?
anonymous
  • anonymous
yes i do. sorry, was distracted lol
BioHazard9064
  • BioHazard9064
Glad to help

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