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9 July, 16:28

Each side of a square is increasing at a rate of 5 cm/s. At what rate is the area of the square increasing when the area of the square is 25 cm2?

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  1. 9 July, 16:38
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    A=s^2

    da/dt=2sds/dt

    we know each side increases at 5cm/s

    da/dt=2s (5cm/s)

    note, when a=25cm2, s=5cm

    so da/dt=2 (5cm) (5cm/s) = [50cm2/s]
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