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

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Warm-UpUse 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?
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(4-1) Organizing Data into Matrices

• Objective
• To Identify matrices and their elements
• To organize data into matrices

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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.

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Write the dimensions of each matrix.
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You can identify a matrix element by its position
within the matrix. Use a lowercase letter
subscripts. The subscripts represent the
elements row number and column number.
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Energy Energy is often measured in British
thermal units (Btus). Write a matrix to represent
the data below. Estimate the values from the
graph.
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Solution
Production Consumption

Countries
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TRY THIS
a. Rewrite the matrix as a 2 x 3 matrix. Label
the rows and columns.
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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 x 3 matrix to
show the data.
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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

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Solution
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AssignmentPage 170 1-17