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A model rocket takes off from an elevated launch pad 9 feet above the ground. The rocket's elevation follows the function h = $$-2t^2$$ + 12t + 9, where h represents the height after t seconds. Which of the following ordered pairs (t, h) could be the rocket's height at a given time?Indicate all possible values.
A,D,E,F显示答案
以上解析由 考满分老师提供。
