Electric usage over the course of a day varies. The graph shown is of electricity costs per hour. Cost per hour 20 18 16 14 12 10 8 6 ET 4 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time(hours) What is the average cost between t = 17 and t = 20 hours? $12/hr $14/hr $16/hr $18/hr Cost $

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