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$\"\"$

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The weekly cost C of producing x units in manufacturing process is $\"\"$ .

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The number of the units x produced in t hours $\"\"$ .

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The composition of C with x is $\"\"$ .

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Simplify)

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The composite function $\"\"$ represents the amount of weekly cost as a function of the number of units produced in the amount of time in manufacturing process.

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$\"\"$

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The value of $\"\"$ .

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The composite function $\"\"$ represents the amount of weekly cost as a function of the number of units produced in the amount of time in manufacturing process.

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$\"\"$

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The weekly cost C of producing x units in manufacturing process is $\"\"$ .

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The number of the units x produced in t hours $\"\"$ .

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The composition of C with x is $\"\"$ .

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Simplify)

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The cost C of the x units produced in t hours is $\"\"$ . $\"\"$

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The cost of the units produced in 4 hours is $\"\"$

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Simplify) $\"\"$

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The cost of the units produced in 4 hours is 1950.

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$\"\"$

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The weekly cost C of producing x units in manufacturing process is $\"\"$ .

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The number of the units x produced in t hours $\"\"$ .

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The composition of C with x is $\"\"$ .

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Definition of $\"\"$ )

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$\"\"$ (Simplify)

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The cost C of the x units produced in t hours is $\"\"$ . $\"\"$

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The amount of cost $\"\"$ is $\"\"$ dollars.

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The cost 15,000 dollars produced in t hours is

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$\"\"$ .

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$\"\"$ (Subtract 750 from each side)

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$\"\"$ (Simplify)

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$\"\"$ (Divide each side by 300)

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$\"\"$ hours (Simplify) $\"\"$

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The cost 15,000 dollars produced in 47.5 hours.