题库搜索>问题求解PS-13315
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?
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要使N（t）的值最大，t=5，而t是从2点以后算的，我们那时候应该是7点
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题目信息1m20s
平均耗时
90.8%
平均正确率
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