For a fundraiser, Marcus needs to raise $850 in order to meet his goal. Marcus will walk a certain number of miles, and he will order to morbi receive donations for each mile he walks. The table represents the amount of money he has left to raise after x miles of walking. X 1 3 5 7 9 11 ii g(x) $820 $760 $700 $640 $580 $520 What is the average rate of change over the interval [5, 9]?​