Problem Solving
试题详情
题目：
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?
选项:
A、5:30
B、7:00
C、7:30
D、8:00
E、9:00
答案:
B
提问：
According to a certain estimate, the depth,in centimeters, of the water in a certain tank at t hours past 2:00 in the morning is given by for. According to this estimate, at what time in the morning does the depth of the water in the tank reach its maximum?
5:30
7:00
7:30
8:00
9:00
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