Substitute in rate of change formula.
(Product of two same signs is positive)
(Add: )
The rate of change represented in the table is .
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in rate of change formula.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2ff029d4967f4378e6386ecb9fb45f6b.png\")
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.