5. A football player, Peter hits a football from a height of 1 m above the ground and its height is given by the equation k = -3.21 + 12.8t + 1, where h is the height in meters above the ground, and t, in seconds, is its time in the air. When will the ball reaches its maximum height? What is the maximum height?

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Q: How many non-negative integer solutions are there of the equation: x + y +z+ w= 15?

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Q: C. 21) Solve for x. 3 X -2 8 + X

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