Final answer:
The sentences that use commas correctly are those estimating cost, scheduling a retirement party, and mentioning recruiting firms in Michigan. Incorrect usage occurred in the address and the title with a name where proper punctuation was missing.
Step-by-step explanation:
The correct use of commas is key to clear written communication. We can determine the sentences that use commas correctly by applying standard punctuation rules concerning numbers, dates, titles with names, addresses, and nonessential vs. essential information. Here are the sentences that use commas correctly:
However, the other two sentences have issues:
It’s also important to notice that different style guides may have slightly different rules regarding the use of the Oxford comma and other punctuation details.