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The equation  $y = -16t^2 + 80t$ describes the height (in feet) of a projectile launched from the ground at 80 feet per second. At what  will the projectile reach 36 feet in height for the first time? Express your answer as a decimal rounded to the nearest tenth.

 Feb 7, 2022
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By the quadratic formula, the answer is t = 0.7.

 Feb 8, 2022

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