Matrices Review (1-23-26)

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

• 8
• 9.01
• 6
• 1

Subtract

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

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

find: B*A

• 47     30
  9     5
• 17     15
  42     35
• 10     25
  7     1
• not possible because rows do not match columns

Perform the indicated operation.  If it’s not possible, select Not Possible. 

• 7
  -7
  -6
  20
• 7 
  -9
  -6
  20
• Not Possible
• 7
  -9
  2
  20

Find the product.

• undefined
• -3   16
  17   12
  8   -10
• 3   12 
  -15  -8
  -1   -3

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

Which of the following is NOT defined for matrix multiplication A X B?

• 
• 
• 
• 

What is the value of a₂₃ from the given matrix?

• no entry a₂₃

• -42

• 6

• 33

What would be the dimensions (output) of AB?

• undefined

• 2 X 2

• 3 X 2

• 3 X 3