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- Real analysis Show by def that conv seq is cauchy[Combinatorics] How do you solve this?A specific car’s fuel economy in miles per gallon can be approximated by f(x) = 0.00000056x4 – 0.000018x3 +1.38x- 0.38, where x represents the car’s speed in miles per hour. Determine the fuel economy when the car is traveling 40, 50, and 60 miles per hour. Process Questions: What is f(40)?, f(50)?, and f(60)? Which car speed maximizes fuel consumption? Can you suggest some ways or tips on how to save fuel? What do you think is the best way to save fuel? Why? How did the modelling process help you answer the different problems? How do values of one variable behave in terms of the other in the polynomial function that models a real- world situation?