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The function is $\"\"$ .

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(a)

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Since $\"\"$ is a function of $\"\"$ , $\"\"$ is a independent variable and $\"\"$ is a dependent variable.

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Independent variable is $\"\"$ .

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Dependent variable is $\"\"$ .

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(b)

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Evaluate $\"\"$ .

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Substitute $\"\"$ in the function $\"\"$ .

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$\"\"$

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The value of $\"\"$ is $\"\"$ .

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In 2005, there were $\"\"$ million people 20 years of age or older.

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(c)

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Evaluate $\"\"$ .

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Substitute $\"\"$ in the function $\"\"$ .

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$\"\"$

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The value of $\"\"$ is $\"\"$ .

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In 2005, there were $\"\"$ million people.

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(a)

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Independent variable is $\"\"$ .

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Dependent variable is $\"\"$ .

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(b) The value of $\"\"$ is $\"\"$ ; In 2005, there were $\"\"$ million people 20 years of age or older.

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(c) The value of $\"\"$ is $\"\"$ ; In 2005, there were $\"\"$ million people.