The sequence below shows Marisa’s library fine starting on the first day her book is overdue and for each additional day afterward:$0.50, $0.65, $0.80, $0.95, $1.10, ...Let f(n) represent Marisa’s library fine (in dollars), where n is the number of days the book has been overdue, starting with n=1 for the first day overdue.Which equation represents Marisa’s library fine as a function of a book that is n days overdue?
The fine increases by $0.15 each day, so it follows a linear rule with rate 0.15. Since the fine is $0.50 on the first day, the rule must give f(1) = 0.50. Choice C gives 0.15(1) + 0.35 = 0.50, so f(n) = 0.15n + 0.35.
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