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The depth of a river changes after a heavy rainstorm. Its depth, in feet, is modeled as a function of time in hours. Consider this graph of the function.
What is the average rate of change for the depth of the river, measured as feet per hour, between hour 9 and hour 18? Show your work.

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ill give brainliest HELPPPPPPPPPPPPPPPPPPPME EEEEEEEEEEEEEEEE The depth of a river changes after a heavy rainstorm Its depth in feet is modeled as a function of class=