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21 July, 01:34

A cliff diver dives from a cliff height of 70 feet. The equation describing his height during the dive is h = - 16t 2 + 70. Find the time it takes the diver to be 50 ft above the water.

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  1. 21 July, 04:47
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    1.118 seconds

    Step-by-step explanation:

    h = 50

    h = - 16t^2 + 70

    substitute h=50

    50 = - 16t^ 2 + 70

    subtract 70 from each side

    50 - 70 = - 16t^2

    -20 = - 16 t^2

    divide each side by - 16

    -20/-16 = t^2

    1.25 = t^2

    take the square root of each side

    sqrt (1.25) = sqrt (t)

    we only take the positive because time can only be positive

    1.118 = t
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