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The length x of a rectangle is decreasing at the rate of 5 cm/minute and the width y is increasing at the rate of 4 cm/minute. When \( x = 8 cm \) and \( y = 6 cm \) , find the rate of a change of (a) the perimeter, (b) the area of the rectangle.
cbse
class12
modelpaper
2009
sec-b
q11
math
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asked
Dec 21, 2012
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thanvigandhi_1
edited
Dec 29, 2012
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