$\"\"$

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The function is $\"\"$ , where $\"\"$ is cost in dollars and $\"\"$ is years.

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(a). Find $\"\"$ as a function 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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$\"\"$

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

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(b).

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

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The function is $\"\"$ .

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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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$\"\"$

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The function is $\"\"$ .

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

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$\"\"$

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$\"\"$

\

$\"\"$

\

$\"\"$ .

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$\"\"$

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The function is $\"\"$ .

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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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(a). The function is $\"\"$ .

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(b). $\"\"$ , $\"\"$ and $\"\"$ .