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The function f(t) = -3t^2 + 18t + 21 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object hit the ground ( please help !!! )

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The function f(t) = -3t^2 + 18t + 21 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object hit the ground￼￼￼ ( please help !!! )

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The function f(t) = -3t^2 + 18t + 21 models the approximate height of an object t seconds after it is launched. How many seconds does it take the object hit the ground ( please help !!! )