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Let f(x)=-5x+20x-12. Find the x-coordinate of the vertex. Round your answer to 2 decimal places. Suppose that an object is projected in such a

Let f(x)=-5x+20x-12. Find the x-coordinate of the vertex. Round your answer to 2 decimal places. Suppose that an object is projected in such a way that its height above the ground in feet after t seconds is given by s() -16+48t+16. Find the maximum height of the object. Do not write the units in your answer.

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