- [Required] Use the high-low method to estimate total fixed costs per year and the variable cost per mile. State your results in the cost equation form Y=f+vX. - [Required] What would the estimated costs be if the trucks drove 500,000 miles in year 7 ? Scattergraph Method. Refer to the data in the previous exercise for the city of Rockville. - [Required] Use the scattergraph method to estimate total fixed costs per year and the variable cost per mile. State your results in the cost equation form Y=f+vX by filling in the dollar amounts for f and v. - [Required] What would the estimated costs be if the trucks drove 500,000 miles in year 7 ? Regression Analysis. Regression analysis was run using the same data for the city of Rockville. 1. [Required] Use the regression output to develop the cost equation Y=f+vX by filling in the dollar amounts for f and v. 2. [Required] What would the city of Rockville's estimated costs be if its trucks drove 500,000 miles in year 7