1. Opener What is the reciprocal of 1/9? What is |-8+-2|? In January, the wind chill was -8 degrees. In August, the heat index was 108. Find the difference between these temperatures.

2. What is the matrix?

3. The Matrix is a movie….. The Matrix is a 1999 American science-fiction-action film starring Keanu Reeves. The plot according to the Internet Movie Database: A computer hacker learns from mysterious rebels about the true nature of his reality and his role in the war against the controllers of it.

4. The Math Matrix a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules 1 4 3 6 8846 7351

5. The Math Matrix

6. Adding and Subtracting Add or subtract each element in the first matrix by its corresponding element in the other matrix. Matrices MUST be the same size to add or subtract. They MUST have the same number of rows and columns The answer matrix will be the same size as the matrices in the original problem.

7. Adding

8. Subtracting

9. Practice

10. Multiplication by scalar To multiply a matrix by a scalar, simply multiply each element by the scalar. The answer matrix will be the same size as the matrix in the problem.

11. Multiplication by scalar

12. Multiplication by scalar This matrix represents the sales total, in dollars, of two pet store owners. If there is a 5% tax, how much tax will be charged in each store for each pet?

13. Practice

14. Coming Tomorrow…