The length x of rectangle is decreasing at the rate of 5cm per min and the width y is increasing at the rate 4cm per minute. If x=8, y= 6cm.Find the rate of change of the permiter x area of rectangle
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Perimeter= 2(l+b)
=2(8+6)
=28
dx/dt= -5cm/minute
dy/dt= 4cm/minute
d(2(X+Y))/dt
=2(dx/dt +dy/dt)
=2(-5+4)
= -2cm/minute
=2(8+6)
=28
dx/dt= -5cm/minute
dy/dt= 4cm/minute
d(2(X+Y))/dt
=2(dx/dt +dy/dt)
=2(-5+4)
= -2cm/minute
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