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OpenStudy (anonymous):
Suppose that a rocket is launched straight upward into the air with an initial speed of 25 m/sec from an initial height of 75 meters above the level ground. The relationship between the elapsed time, t, and the height of the rocket, h, can be modeled by the function h(t) = -4.9t^2 + 25t + 75. How long will it take the rocket to reach a height of 100 meters?
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