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Josh Vincent throws a ball upward from the top of a 75-foot building. The height, s (t), of the ball at any instant t can be determined by the function s (t)= - 16t2+ 80t + 75.
a) At what instant will the ball reach its maximum height?
b) What is the maximum height?
Note: Decide which of the functions you designate to perform its respective graph.

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