Final answer:
The note dated July 15 and due on September 18 runs for exactly 65 days. This is calculated using dates in the Gregorian calendar, summing up the remaining days in July from the 15th, all the days in August, and the days up to the 18th in September.
Step-by-step explanation:
The question is asking you to calculate the number of days between two dates. Specifically, you are being asked to determine the number of days between July 15 and September 18. The answer is calculated using the principles of the Gregorian calendar, the calendar system we use today, which was introduced as a more accurate version of the Julian calendar.
In July, there are 31 days, so from July 15 to the end of July is 16 days (31 minus 15). August has 31 days in total, and from 1st to 18th September there are 18 days. Summing these together, 16 days (July) + 31 days (August) + 18 days (September) equals 65 days.
So, the note which was dated on July 15 and due on September 18 runs for exactly 65 days— answer option A.
Learn more about Gregorian Calendar