Can you explain rule 1?

@Tori, maybe I can help. Rule #1 states that "The computer in each office was bought either in an earlier year than or in the same year as the printer in that office." This means that an office's computer was always bought before (in other words, earlier than) or in the same year as the office's printer. This can be written as "C is greater than or equal to P" in terms of age in the office. If the computer was bought in a year before the printer, it must be older to the office than the printer, so we can write that it is greater than the printer. The computer will always be greater than or equal to the printer in terms of its age in the office, which is what this scenario is all about. Does that make sense? Let us know if you have any other questions and best of luck with your studies!