Matrix Review

What is the name of each entry of a matrix?

• Row

• Element

• Dimension

• Numbers

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

In Matrix R (pictured) what element is r₂₃?

• 8

• 9.01

• 6

• 1

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

Add

• 11    8
  -4     2
• 3     2
  -6    -6
• -3    2
  -4    -6
• 10    8
  -6    2

Subtract

• -5
  -8
  3
  10
• -9
  8
  3
  2
• 5
  -8
  3
  10
• -5
  8
  3
  2

Multiply

• 20     15    -10
  30     -5         0
• -20      15     -10
  30     -5          0
• 1        8       3
  11     4        5
• 20     -15     10
  -30         5        0  

What must be true in order to ADD two matrices?

• They must be square.

• The size must be equal.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.

What is the value of element a₂₃?

• 2

• -1

• 6

• 1