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A juggler is performing her act using several balls. She throws the balls up at an initial height of 4 feet, with

a speed of 15 feet per second. This can be represented by the function H(t) = −16t2 + 15t + 4. If the juggler doesn't catch one of the balls, about how long does it take the ball to hit the floor?

 7.52 seconds

 1.15 seconds

 0.47 seconds

 0.22 seconds

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