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The side of a square plate grows at 2 cm/s. Its area rises at what rate when the side is 5 cm?
A10 cm^2/s
B40 cm^2/s
C20 cm^2/s
D25 cm^2/s
Answer & Solution
Correct answer: C. 20 cm^2/s
A = a^2 gives dA/dt = 2a(da/dt) = 2(5)(2) = 20.
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