A baseball is hit and its height is a function of time, h(t) = -16t 2 +

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Question:

A baseball is hit and its height is a function of time, h(t) = -16t² + 45t + 1, where h is the height in feet and t is the time in seconds, with t = 0 corresponding to the instant the ball is hit. What is the height after 2 seconds? What is the domain of this function?