Quiz Review Lessons 0.1-0.3 Matrices (Math 8)

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.

In Matrix R (pictured) what element is a₂₃?

• 8
• 9.01
• 6
• 1

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle

Subtract

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

What are the dimensions of this matrix?

• 3x1
• 1x3
• 3x3
• 1x1

Can the operation be performed?

• Yes

• No

• Sometimes

• only Ms. Jones knows

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 are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6