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a person on a bridge 160 ft above the ground drops his cellphone (see picture). the height of the falling cell phone is modeled by

a person on a bridge 160 ft above the ground drops his cellphone (see picture). the height of the falling cell phone is modeled by the equation. where the height is measured in feet and the time t is measured in seconds. how many seconds will it take the cell phone to reach 45 ft above the ground? (3 decimals) height= -16t^2+ 8t+160

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