$\"\"$

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(a).

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The revenue is $\"\"$ .

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The general form of quadratic equation is $\"\"$ .

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Compare the two equations $\"\"$ , $\"\"$ , $\"\"$ .

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Vertex is $\"\"$ .

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Axis of symmetry $\"\"$ .

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$\"\"$

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$\"\"$

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Axis of symmetry is $\"\"$ players, since $\"\"$ is in thousands.

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The minimum marginal cost is is obtained when there are $\"\"$ players.

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$\"\"$

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(b)

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Find the minimum marginal cost.

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Minimum marginal cost occurs at minimum value.

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$\"\"$

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$\"\"$

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$\"\"$

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$ $\"\"$

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The mimimum marginal cost is $\"\"$ dollars.

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$\"\"$

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(a).The minimum marginal cost is obtained when there are $\"\"$ players..

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(b). The mimimum marginal cost is $\"\"$ dollars.