This document discusses representing bookstore inventory data as matrices and using matrix algebra. It provides inventory quantities for two bookstores, Crazy Ken's Campus Bookstore and Wacky Wally's College Bookstore, categorized by book type and binding. It then asks the reader to (a) represent each bookstore's inventory as a matrix, (b) do the same for the other bookstore, and (c) use matrix algebra to determine the total inventory of a company formed by merging the two bookstores.

1. What does this picture
have to do with matrices?
Matrix

2. A little warm up ...

3. A little warm up ...

4. Crazy Ken’s Campus Bookstore’s inventory of books consists of the
following quantities.
Hardcover: textbooks—5280; fiction—1680; nonfiction—2320; reference—1890.
Paperback: textbooks—1940; fiction—2810; nonfiction—1490; reference—2070.
(a) Represent the inventory of Crazy Ken’s Campus Bookstore as a
matrix.
Wacky Wally’s College Bookstore’s inventory of books consists of
the following quantities.
Hardcover: textbooks—6340; fiction—2220; nonfiction—1790; reference—1980.
Paperback: textbooks—2050; fiction—3100; nonfiction—1720; reference—2710.
(b) Represent the inventory of Wacky Wally’s College Bookstore
as a matrix.

5. (c) Use matrix algebra to determine the total inventory of a new
company formed by the merger of Crazy Ken’s Campus
Bookstore and Wacky Wally’s College Bookstore.

7. Matrices and multiplication
... this is called "scalar multiplication"
or "multiplication by a scalar".

8. Now you try ...
without your calculator
with your calculator

9. Now put it all together ...

11. Attachments
Matrix