Warm-Up: Use the table to answer to following questions.

1. Warm-Up:Use the table to answer to following questions. 1. How many units were imported to the United States in 1996? In 2000? 2. How many more units were imported in 1998 than in 1996? 3. How many more units were imported than exported in 2000?

2. (4-1) Organizing Data into Matrices Objective: To Identify matrices and their elements To organize data into matrices

3. Matrices • A matrix (matrices) is a rectangular array of numbers written within brackets. • You represent a matrix with a capital letter and classify it by its dimensions. • The number of horizontal rows and the number of vertical columns determine the dimensions of a matrix. • Each number in a matrix is an Element.

4. Write the dimensions of each matrix.

6. You can identify a matrix element by its position within the matrix. Use a lowercase letter subscripts. The subscripts represent the element’s row number and column number.

10. Energy Energy is often measured in British thermal units (Btus). Write a matrix to represent the data below. Estimate the values from the graph.

11. Solution: Production Consumption [ ] Countries

12. TRY THIS: a. Rewrite the matrix as a 2 x3 matrix. Label the rows and columns.

13. TRY THIS: Three students kept track of the games they won and lost in a chess competition. They showed their results in a chart. Write a 2 x3 matrix to show the data.

14. Gymnastics The table below shows scores from the 2004 Olympics in Athens, Greece. • Write a matrix W to represent the information. • Use a 4x4 matrix

15. Solution:

16. AssignmentPage 170 # 1-17