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The piecewise function is $\"\"$ where $\"\"$ represents passengers trips in millions.

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$\"\"$ is represents the year $\"\"$ .

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$\"\"$ is represents the year $\"\"$ .

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$\"\"$ is represents the year $\"\"$ .

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(a)

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The number of passenger trips in $\"\"$ :

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$\"\"$ is represents the year $\"\"$ .

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Consider the function $\"\"$ .

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Find $\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$ .

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The number of passenger trips in $\"\"$ :

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$\"\"$ is represents the year $\"\"$ .

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Consider the function $\"\"$ .

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Find $\"\"$ .

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

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$\"\"$

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$\"\"$

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$\"\"$ .

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(b)

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The function $\"\"$

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All possible values of $\"\"$ is domain of the function.

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Observe the function defined when $\"\"$ and $\"\"$ .

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The domain of the function is $\"\"$ .

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(a) $\"\"$ million passenger trips in $\"\"$ and $\"\"$ million passenger trips in $\"\"$ .

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(b) The domain of the function $\"\"$ is $\"\"$ .