Matrices Review Dimensions and Addition

What comes first in the order?

• Row
• Column

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle

In Matrix R (pictured) what element is in the second row, third column?

• 8
• 9.01
• 6
• 1

In Matrix R (pictured) what element is a₂₃?

• 8
• 9.01
• 6
• 1

What is the entry at f₄₂?

• 23

• -81

• -44

• 99

• -56

What must be true in order to ADD two matrices?

• They must be square.
• The dimensions must be equal.
• The determinant can't equal 0.
• The column of the 1st must equal the row of the 2nd.

Find A-B

• -3     1
  7     -1
• 1     0
  1     -4
• -4       0
  6     -1
• not possible because rows do not match columns

Can the operation be performed?

• Yes
• No
• Sometimes
• only Mrs. Jordan knows