Final answer:
The two sentences with the correct formal tone for a business blog are sentence 3 and sentence 4.
Step-by-step explanation:
The two sentences with the correct formal tone for a business blog are sentence 3: The new phone features an excellent camera that is ideal for capturing your precious moments. and sentence 4: The CEO reports that the release of the company’s new smartphone will be delayed by two months. These sentences convey a professional and formal tone by focusing on the features of the product and providing updates on important business information.