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\textbf{Math 225: Calculus III}
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\textbf{Quiz 4}\quad \textsl{Feb. 20/22, 1996}
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\item 
A rectangular sheet of metal is expanding as its temperature rises. When
the width is 3 cm and the length is 5 cm, the width is increasing at a rate
of 0.35 cm/hour and the length is increasing at a rate of 0.40 cm/hour.
Determine the rate at which the area of the sheet is increasing.
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\item 
Let $f(x,y) = e^{x^3 y}\sin(x y)$. Compute $f_{xy}(0,\pi)$.
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