While performing a science experiment, Joshua threw ball-bearings off a bridge; the position of one of the thrown ball-bearings above the ground is modeled by the equation h(t) =-5t2 +9t+32, where t represents the time in seconds and h(t) represents the height in meters. Part A: Joshua was investigating the time it takes for the ball-bearing to strike the ground below the bridge He began by solving the equation above by completing the

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A: