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Jason fills his motorcycle with 4liters of unleaded gasoline. Every hour he travels, the motorcycle consumes 1.5liters at constant speed. The graph represents the gasoline left in his motorcycle (y) after traveling for (x)hours.



Questions:
A. What is the amount of gasoline after a certain hour?
B. What is the constant decrease of gasoline per hour?
C. After how many hours will he need to fill or to buy gasoline again?
D. How many liters of gasoline is needed if he will travel a certain distance with the same speed?