Question 1107103
A rocket is fired upward from some initial distance above the ground. Its height in​ feet, h,above the​ ground, t seconds after it is​ fired, is given by h=-16t^2+48+4320.
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How long does it take for the rocket to reach its maximum height?
h=-16t^2+48+4320
h=-16t^2 + 4368
The Max is the vertex of the parabola, at t = -b/2a
b = 0 --? Max = 4368 feet.
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After it is​ fired, the rocket reaches the ground at t= sec.
I'll take your word on that.