Final answer:
The subject of this question is Accounting and the student is asking about a credit sale of merchandise on August 19th.
Step-by-step explanation:
The subject of this question is Accounting. The student is asking about a credit sale of merchandise on August 19th. Accounting is the process of recording, summarizing, and analyzing financial transactions of a business. In this case, a credit sale refers to a transaction where the customer purchases merchandise on credit, meaning they will pay for it at a later date.