If it's only regarding the invention of a specific dental equipment, it'll be to inform. the student is preparing to share their knowledge on the dental drill.
to persuade is usually the purpose when there's a question or an argument being raised, and in this case, it doesn't sound like anyone would be against dental drills. dental drills is also a fairly dry topic, so it's doubtful that the student would be aiming to entertain. it isn't a demonstration because the student likely isn't giving a step by step how to in regards to using a dental drill.
Explanation:
led to economic depression
The answer is: Role Strain
Example of this would be when a supervisor of a company is dating her co- workers.
In such situation, she has two different roles. One is as a boss that has to be strict and have a set of expectation that must be fulfilled by employees. On the other hand, she is also a girlfriend that has to give a full support to his loved one.
When her boyfriend make a mistake in the office, it could create a confusion for her since she's unsure which role she need to assume to deal with it.
Ann Hutchinson was<span> a puritanical religious expert, and an influential member in the Antinomian discussion that thrilled the newborn Massachusetts anchorage territory.</span>