D
5*2+2=12
12*5=60
2007-06-04 03:07:20
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answer #1
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answered by pito16places 3
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Answer is D) 5 units.
How I arrived at this answer:
Let the width be x.
Let the lenth by 2x + 2.
So the area is x(2x +2) = 60
You can solve this as you solve quadratic equations.
The answe you'll get for x is 5 and -6.
-6 is impossible for the width, so the answer is 5 units.
Hope this helps.
2007-06-04 10:10:03
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answer #2
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answered by Saman 2
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let b=x
l=2x+2
2(2x+2)=60
2x^2+2x-60=0
x^2+x-30=0
(x+6)(x-5)
x=5 units
2007-06-04 10:11:59
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answer #3
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answered by Anonymous
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x(2x+2)=60
2x^2+2x-60=0
2(x^2+x-30)=0
2(x+6)(x-5)=0
x=5 and -6
since width can't be negative the answer is d. 5
2007-06-04 10:09:19
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answer #4
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answered by Adam A 2
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l=2+2w
A=l*w
60=(2+2w)*w
60=2w+2w^2 (divide all by 2)
30=w+w^2
0=w^2+w-30
0=(w+6)(w-5)
w=-6 or 5
since width is not negative, the width is 5 - answer D
2007-06-04 10:25:12
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answer #5
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answered by hrhbg 3
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width is the unknown (x)
A(rectangle) = length x width
60 = (2x+2)(x)
60 = 2x^2 + 2x
30 = x^2 + x
0 = x^2 + x - 30
0 = (x - 6)(x + 5) ----------> x = 6 or -5
So, x = 6 units --------> C
2007-06-04 10:09:29
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answer #6
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answered by preichwein 3
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D x * (2x+2) = 60.........2x^2+ 2x - 60 = 0
( x - 5 )(2 x +12 ) = 0 ....x=5
2007-06-04 10:37:03
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answer #7
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answered by pioneers 5
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D
60=(2x+2)(x)
60=2x^2+2x
30=x^2+x
30=25+5
SO x must = 5.
2007-06-04 10:15:15
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answer #8
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answered by smilestace2001 2
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let width = w
length = 2w + 2
w.(2w + 2) = 60
2w² + 2w - 60 = 0
w² + w - 30 = 0
(w + 6).(w - 5) = 0
w = 5
ANSWER D)
2007-06-04 11:32:39
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answer #9
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answered by Como 7
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I think it's A
2007-06-04 10:07:58
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answer #10
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answered by Anonymous
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3⤋