Ruth borrowed a book from a library. the library charged a fixed rental for the book and a late fee for every day the book was overdue. the expression below shows the charges ruth paid for the book when she returned it x days after the due date.. 2 + 0.25x. what does the second term of the expression represent? . the total late fee paid . the fixed rental for the book . the late fee per day for the book . the number of days the book was overdue.