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Mathematics 18 Online
OpenStudy (anonymous):

HELP!! PICTURE ATTACHED!

OpenStudy (anonymous):

OpenStudy (aum):

Ball thrown up will trace out a parabola that opens downward. Downward opening parabolas have negative coefficient for the x^2 term. This will help eliminate two choices. When you put x = 0, y should be 15 because the "ball starts 15 feet above the ground". This will determine the correct answer out of the remaining two.

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