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Q)

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 rates of change of (a) the perimeter

This is (a) part of the multi-part question q7

$\begin{array}{1 1} (A)\;-2cm/min. \\(B)\;2cm/min. \\ (C)\;-3cm/min. \\ (D)\;3cm/min.\end{array} $

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