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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 t will the projectile reach 86 feet in height for the first time? Express your answer as a decimal rounded to the nearest tenth.

 Jul 24, 2022
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The answer is 4.8 seconds.

 Jul 24, 2022

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