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A creature on the moon throws a rock off a cliff. The height of the rock above the surface of the moon, in meters, t seconds after it is thrown is given by h(t) = −t ^2 + 8t + 10. When does the rock hit the surface of the moon?

 Mar 14, 2021
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By the quadratic formula, the rock hits the surface of the moon at t = 9 + sqrt(34) seconds.

 Mar 14, 2021

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