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The height s of a ball after t seconds when thrown straight up with an initial speed of 70 feet per second from an initial

The height s of a ball after t seconds when thrown straight up with an initial speed of 70 feet per second from an initial height of 5 feet can be modeled by the function s(t)= -16t squared + 70t + 5

(a) When will the height of the ball be 50 feet?

(b) When will the height of the ball be 70feet?

(c) Will the ball ever reach a height of 140 feet?

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