Question: h(t)=-15t 2 +300t for 0 < t < 20 The height h in feet of a model rocket above the ground t seconds after lift

h(t)=-15t²+300t for 0 <t<20

The height h in feet of a model rocket above the ground t seconds after lift off is given by the above equation. When is the rocket at least 350 feet off the ground?

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