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Mathematics 13 Online
OpenStudy (anonymous):

if a stone is tossed upward with velocity of 30m/s from a height of 10m above the surface of the moon, its height,h, is given by the function h=-t2+30t+10. when did the stone reach a height of 210m?

OpenStudy (anonymous):

Just set the equation equal to 200 and solve for t.

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