Which of Newton’s three laws applies? When you put a book on a table, the table pushes on the book
which law is that?

Probably the third as the book is being pulled down and the table is pushing up with an equal and opposite force, keeping it at rest.

Newton's First and Second Laws of Motion. A force is a push or a pull on an object. When you place a book on a table, the book pushes downward on the table and the table pushes upward on the book. The two forces are equal and there is no resulting motion of the book

What formula  this one  (x_/