$\"\"$

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Sum of the perpendicular distances of the vertical feeder lines is $\"\"$ .

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Graph:

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Graph the function: $\"\"$ and label the minimum point.

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$\"\"$

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Observe the graph:

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The sum of perpendicular distances is minimum when $\"\"$ .

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The equation of the trunk line is $\"\"$ .

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Substitute $\"\"$ .

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$\"\"$

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The equation of the trunk line is $\"\"$ .

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$\"\"$

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Find the sum of lengths of the feeder lines when $\"\"$ is minimum.

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$\"\"$

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

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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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Sum of the lengths of the feeder lines is $\"\"$ .

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$\"\"$

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The equation of the trunk line is $\"\"$ .

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Sum of the lengths of the feeder lines is $\"\"$ .