March 29, 2017

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A person jumps off a 20m high cliff into water below. The height of the person above the ground at time t seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?

  • Math - solving quadratic equations with factoring - ,

    10 = -5t^2 + 30

    5t^2 = 20
    t^2 = 4
    t = 2

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