Mathematics, 13.04.2021 01:00 milamdaniela

The function f(x) = -5x² + 20x + 55 models the height of a ball x seconds after it is thrown into the air. What is the total time that the ball is in the air?

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The function f(x) = -5x² + 20x + 55 models the height of a ball x seconds after it is thrown into th...