Give a clear synopsis on how to use the unit circle.

Plz heeeeeeelp plz give me the answer

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?