Final answer:
The mathematical representation for the post office receiving at least 8 pounds of mail per day is p ≥ 8, which means the number of pounds of mail is greater than or equal to 8.
Step-by-step explanation:
The question asks how to represent mathematically the amount of mail the post office receives per day, given that it is at least 8 pounds. The correct mathematical representation for the post office receiving a minimum (or at least) of 8 pounds of mail daily would be p ≥ 8, where p stands for the pounds of mail received. This inequality reads as "p is greater than or equal to 8," meaning that the post office receives 8 pounds or more each day.