$\"\"$

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Observe the graph: The area is bounded between $\"\"$ and $\"\"$ .

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The number of subintervals are $\"\"$ .

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The width of the subintervals is $\"\"$ .

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From the graph approximate the function values.

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

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Find the upper sum.

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The maximum value on each subinterval occurs at the right end point.

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$\"\"$ .

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Right end points of the graph are $\"\"$ and $\"\"$ .

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The upper sum( $\"\"$ ).

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$\"\"$

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$\"\"$

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The upper sum is $\"\"$ .

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$\"\"$

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Find the lower sum.

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The minimum value on each subinterval occurs at the left end point.

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$\"\"$ .

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Left end points of the graph are

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

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The lower sum is $\"\"$ .

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$\"\"$

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$\"\"$

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The lower sum $\"\"$ .

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The area of the shaded region falls between $\"\"$ square units and $\"\"$ square units.

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$\"\"$

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The area of the shaded region falls between $\"\"$ square units and $\"\"$ square units.