Answer :
Answer: Formal and informal
Explanation:
Based on the information given, we should note that Lauren’s speech at the banquet will be a formal presentation while that of her presentation to her classmates will be an informal presentation.
A formal presentation is when one wants to share ideas with a particular group and the person has been given time for him or her to prepare. It's done for a formal setting or occasion.
Informal presentation are usually done impromptu when the person has a little time to give the presentation and is typically among ones colleagues or friends and not for a formal setting.