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$4.[-/1$ Points$]$

$$ SCALCET$93\mathrm{.}9\mathrm{.}006.$MI$.$

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The length of a rectangle is increasing at a rate of $9c\frac{m}{s}$ and its width is increasing at a rate of $7c\frac{m}{s}.$ When the $13$ cm and the with is $7$ cm $,$ how fast is the area of the rectangle lincreasing $(lnc\frac{m^2}{s})?$

$c\frac{m^2}{s}$

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