How would this question be done? Please explain step by step as I struggle with accounting

We Deliver operates a fleet of delivery trucks in Halifax. Analysis shows that if a truck is driven 150,000 kilometres during a year, the average operating cost is 11.9 cents (\$0.119) per kilometre. If a truck is driven only 94,000 kilometres during a year, the average operating cost increases to 13.9 cents (\$0.139) per kilometre. Required: 1. Using the high-low method, estimate the variable and fixed cost elements of the annual cost of truck operation. (Do not round your intermediate calculations. Round the "Variable cost per kilometer" to 3 decimal places.) 2. Express the variable and fixed costs in the form Y=a+bX. (Do not round your intermediate calculations. Round the "Variable cost per kilometer" to 3 decimal places.) 3. If a truck were driven 127,000 kilometres during a year, what total cost would you expect to be incurred? (Do not round intermediate calculations. Round the "Variable cost per kilometer" to 3 decimal places.)