The graph below represents a library fine, in dollars, for a
book returned late after a number of days overdue.
christen returned an overdue book to the library. her fine
was the same as the fine for returning the book yesterday.
which could be the number of days overdue?
library fines
10
14

+
fine (5)
3
6
9 12 15 18 21 24 27 30 33
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