Matrices

What are the dimensions of this matrix?

• 3x1
• 1x3
• 3x3
• 1x1

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.

What must be true in order to MULTIPLY 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

• 
• 
• 
• Undefined

Multiply

• 
• 
• 
• undefined

Given matrices A & B: 
A is a (4x33) matrix
B is a (33x1) matrix
 What are the dimensions of the product of A times B?

• 4x1
• 4x33
• 33x1
• Matrix does not exist

Find B*A

• 
• 
• 
• not possible because rows do not match columns

Find A*B

• 
• 
• 
• not possible because rows do not match columns

Perform the indicated operation using your calculator.

• 
• 
• Not Possible

• 

Which element is located in A_2,3?

• -3

• 5

• -9

• 2