Español A freight train is carrying goods across the country. The distance it has traveled varies directly with the number of gallons of fuel it has used. See the graph below. 400- 350- 300- 250. Distance traveled 200. (miles) 150. 100. 100 150 200 250 300 350 400 Number of gallons used (a) How many miles does the train travel per gallon? O mile(s) (b) What is the slope of the graph?

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