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A firecracker is launched straight up, and its height is a function of time, h(t) = -16t 2 + 128t, where h is the height

A firecracker is launched straight up, and its height is a function of time, h(t) = -16t2 + 128t, where h is the height in feet and t is the time in seconds, with t = 0 corresponding to the instant it launches. What is the height 4 seconds after launch? What is the domain of this function?

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