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Mathematics 13 Online
OpenStudy (anonymous):

The function y = -16t2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take the stone to hit the ground? Round to the nearest hundredth of a second. A. 5.51 seconds B. 7.79 seconds C. 0.25 seconds D. 11.02 seconds

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