How can you tell if an argument is valid?

What is a glossary? a statement of the author’s purpose in writing the book, which may include suggestions for using the book a page at the front of a book that lists units and chapters with their page numbers an alphabetical list of the specialized words and terms used in the book and their definitions an alphabetical list of all topics covered in the book and the pages on which they can be found

When you don’t understand a concept during the lecture, it’s to flag it in your notes and leave a blank space so you can fill in more

List some things u like to do with close friends(bff)