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OG2016 PS Practice #97.
According to a certain estimate, the depth N( t), in centimeters, of the water in a certain tank at t hours past 2: 00 in the morning is given by N( t) = ? 20( t ? 5) 2 + 500 for 0 ? t ? 10. According to this estimate, at what time in the morning does the depth of the water in the tank reach its maximum?
(see OG book)
(see OG book)
(see OG book)
(see OG book)
(see OG book)

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