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Juli is going to launch a model rocket in her back yard. When she launches...

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Juli is going to launch a model rocket in her back yard. When she launches the rocket, the function h(t) = -16r2 +681 model the height, h, in feet of the rocket above the ground as a function of time, t, measured in seconds.(a) When will the rocket hit the ground?(b) When will the rocket be 42 feet above the ground?

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