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18 October, 12:57

The altitude of an object, d, can be modeled using the equation below. d=-16t^2+vt+h From the edge of a 486-foot cliff, Peyton shot an arrow over the ocean with an initial upward velocity of 90 feet per second. In how many seconds will the arrow reach the water below?

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  1. 18 October, 13:39
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    9 seconds

    Step-by-step explanation:

    d=-16t²+vt+h

    The water level will be at 0 level (distance = 0)

    0 = 16t² - 90t - 486

    8t² - 45t - 243 = 0

    (t - 9) (8t + 27) = 0

    t = 9 or t = - 27

    since time should be a positive number, so t = 9 second
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