$\"\"$ \ \

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Observe the graph : \ \

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The function is $\"\"$ . \ \

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The interval is $\"\"$ .

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The integral is $\"\"$ .

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

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

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Where $\"\"$ , $\"\"$ and $\"\"$ 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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Apply summation formula $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ \ \

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$\"\"$

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The required material is $\"\"$ .

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$\"\"$ \ \

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The required material is $\"\"$ .