What is the equation of the line

Jack is considering a list of features and fees for denver bank. jack plans on using network atms about 4 times per month. what would be jack’s total estimated annual fees for a checking account with direct paycheck deposit, one overdraft per year, and no 2nd copies of statements?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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