G11 matrices

What are the dimensions of this matrix?

• 3x1
• 1x3
• 3x3
• 1x1

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

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.

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 is the determinant of this matrix? Calculate by hand.

• 5

• -5

• 0

• -12

Will this matrix have an inverse?

• Yes

• No

• Unable to Determine

What comes first in the order?

• Row
• Column

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6