Algebra

a rock is thrown upward with a velocity of 20 meters per second from the top of a 40 meter high cliff, and it misses the cliff on the way back down. when will the rock be 7 meters from the water, below? round your answer to two decimal places

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  1. letting the water be at height 0, just solve

    40 + 20t - 4.9t^2 = 7

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    posted by Steve
  2. t=56

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    posted by karla

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