(a) True. Suppose A is a not a square matrix, with m rows and n columns. Then A² is not defined, because you can't multiply an m×n matrix by another m×n matrix.
(b) False. As an example, consider the matrices


Then both AB and BA are defined, with


In general, you can multiply any m×n by any n×m matrix.
(c) True. Multiplying a m×n matrix by a n×m matrix always yields a m×m matrix, and multiplying a n×m matrix by a m×n matrix always yields a n×n matrix.
X=62
46+62+62+10=180
There you go
So run then jump so for A it’ll be in the top right box start from zero then move your pencil 2 spaces , then move it up 2 spaces , then that’s your answer ! always remember run then jump ! <33 hope this helps