Introduction Matrices

How many rows does the above matrix have?

• 1

• 3

What is the second element of the second column?

• -10

• 8

• 25

• 3

How many rows does the above matrix have?

• 1

• 3

The matrix above is named A. AB is possible only if B has

• 1 row

• 1 column 

• 3 rows

• 3 columns

The 2 x 2 identity matrix under addition is

• 
• 
• 
• 

The order of the above matrix is

The matrix above can only be added to another matrix which has

• 2 elements

• 2 columns

The sum of the two matrices above is equal to

• The inverse matrix

• The identity matrix

• The diagonal matrix

• The unit matrix

The order of the above matrix is

What is the third element of the first column?

• 1

• -x

• 100

• 3