$\"\"$

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The integral is $\"\"$ .

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Find the area between the graph of function and the $\"\"$ -axis.

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Area of the function is $\"\"$ .

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Where $\"\"$ and $\"\"$ .

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Where $\"\"$ is the number of subintervals.

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$ .

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$\"\"$

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Area of the function is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Apply summation formulas: $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The cost of the production is $\"\"$ .

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$\"\"$

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Graph the region:

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$\"\"$ .

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The cost of the production is $\"\"$ .

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$\"\"$

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The cost of the production is $\"\"$ .