Matrices and algebra

Question 1

What type of matrix is this?
|1 2 3|
|4 5 6|

Answer 1

2 X 3 matrix

Question 2

What type of matrix is this?
|1 0 0|
|0 1 0|
|0 0 1|

Answer 2

Identity matrix

Question 3

|1 2 3| X |1 4|
|6 7 8| |2 5|
|3 6|