Solve the problems using Quadratic function.

From a 96-foot building, an object is thrown straight up into the air then follows a trajectory. The height f(x) of the ball above the building after t seconds is given by the function f(x)=80x-16x2.

a. what is the maximum height than the object will reach?
b. How long will it take the object to reach that maximum height?
c. Find the time at which the object is on the ground?


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