If a certain cannon is fired from a height of 8.4 meters above the ground, at a certain angle, the height of the cannonball above the ground, h, in meters, at time, t, in seconds, is found by the function h(t)=-4.9t^2 +24.5t+8.4. Find the time it takes for the cannonball to strike the ground.

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the answer is d

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