alleryStart learning →A square's side grows at 2 cm/s. How fast is its area growing when the side is 7 cm?
A56 cm²/s
B14 cm²/s
C28 cm²/s
D49 cm²/s
Answer & Solution
Correct answer: C. 28 cm²/s
A = s² gives dA/dt = 2s(ds/dt) = 2 × 7 × 2 = 28 cm²/s.
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