The length \( \mathrm{x} \) of a rectangle is decreasing at the rat...

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The length \( \mathrm{x} \) of a rectangle is decreasing at the rate of \( 5 \mathrm{~cm} / \) minute and the width y is increasing at the rate
\( \mathrm{P} \) of \( 4 \mathrm{~cm} / \) minute. When \( x=8 \mathrm{~cm} \) and \( y=6 \mathrm{~cm} \), find the rate of the change of (a) the perimeter, (b) the area

W of the rectangle.
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