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The height h in feet of a model rocket above the ground t seconds after lift-off is given by h ( t ) = 5

The height h in feet of a model rocket above the ground t seconds after lift-off is given by h(t) = 5t^2 + 100t, for 0 < t < 20. When is the rocket at least 250 feet off the ground? Round answer to two decimal places.

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