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OpenStudy (anonymous):
Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of 21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ 𝑥 = −4.9𝑥2 + 21.3𝑥. About how many seconds will it take for the ball to hit the ground?
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