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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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 \"\"                         (Signs are same. So, product is positive)

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\"\"                             (Add: -1 + 4 = 3)

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\"\"                                   (Add: 2 + 2 = 4)\"\" 

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