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1. The height of a pop fly ball over the time after the ball is hit is modeled by the function, h(t) = -16t2 + 81t + 5. , where is the ball’s height in feet above the ground and is the time in seconds after the ball is hit. Use the quadratic formula to find how many seconds it takes for the ball to hit the ground.

2. Give an example of a quadratic equation with real solutions.

3. Give an example of a quadratic equation with non-real solutions.