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When a ball is thrown upward, the formula h = -16t2 + 64t gives its height h (in feet) above the ground after t seconds. How many seconds does it take for the ball to strike the ground?
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A certain ion has an atomic number of 16, a mass number of 33,and 18 electrons. What is the charge on the ion? What is the identity of this ion? How many neurons does the nucleus of this ion have?
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