$\"\"$

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Observe the graph:

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The number of digital still cameras and film cameras sold by Yellow Camera Stores in recent

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years shown.

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a.

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The number of digital cameras sold from $\"\"$ to $\"\"$ .

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Find the average rate of change.

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Consider the graph there were $\"\"$ (thousands) of digital cameras sold in $\"\"$ and $\"\"$ sold in $\"\"$ .

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$\"\"$ .

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$\"\"$ (Formula for rate of change)

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ and $\"\"$ )

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$\"\"$ (Simplify)

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The average rate of change of the number of digital cameras is $\"\"$ per year.

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$\"\"$

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b.

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The number of film cameras sold from $\"\"$ to $\"\"$ .

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Find the average rate of change.

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Consider the graph there were $\"\"$ (thousands) of film cameras sold in $\"\"$ and $\"\"$ sold in $\"\"$ .

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$\"\"$ .

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$\"\"$ (Formula for rate of change)

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ and $\"\"$ )

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$\"\"$ (Simplify)

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The average rate of change of the number of film cameras is $\"\"$ per year.

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$\"\"$

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c.

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The positive rate in part a represents an increase in sales of digital cameras.

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The negative rate in part b represents a decrease in sales of film cameras.

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$\"\"$

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a. The average rate of change of the number of digital cameras is $\"\"$ per year.

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b. The average rate of change of the number of film cameras is $\"\"$ per year.

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c.The positive rate in part a represents an increase in sales of digital cameras.

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The negative rate in part b represents a decrease in sales of film cameras.