Algebra

An object is thrown downward with an initial velocity of 4 feet per second. The relationship between the distance s it travels and time t is given by s = 4t + 16t2. How long does it take the object to fall 72 feet?

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  1. 4t + 16t^2 = 72
    4t^2 + t - 18 = 0
    (t-2)(4t+9) = 0
    t = 2

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