The regions A, B, C, and D in the figure below are bounded by the graph of the function f and the x-axis. The area of region A is 13, the area of region B is 3, the area of region C is 28, and the area of region D is 4. What is the average value of f on the interval -8, 5] in simplest form? Graph of 8 B -10 -9 -8 -7 -6 -5 -4 3 -2 1 2 3 4 5 6 7 8 9 10 -8

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