A European business has offered to donate to the Salvation Army, but they are requiring a detailed report on expenditures. Chase and his brother are tasked with converting distances measured in miles to kilometers. To estimate the number of kilometers, Chase takes the number of miles, doubles it and then subtracts 20% of the result. Alex, Chase’s brother, first divides the number of miles by 5 and then multiplies the result by 8. a. Write an algebraic expression for each method.

b. Use your answer to part (a) to decide if the two methods give the same answer. Justify your answer using words, numbers, expressions, and/or diagrams.