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Rate of change

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 Rate of change,

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                             \"\"

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\"\"

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Substitute\"\" in rate of change formula.

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\"\"

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\"\"                          (Subtract: 9 - 15 = -6)

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\"\"                             (Subtract: 2- 1 = 1)

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\"\"                                (Divide: \"\")

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\"\" 

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The rate of change represented in the table is \"\".