Since the multiplication between two matrices is not <em>commutative</em>, then , regardless of the dimensions of .
<h3>Is the product of two matrices commutative?</h3>
In linear algebra, we define the product of two matrices as follows:
, where , and (1)
Where each element of the matrix is equal to the following dot product:
, where 1 ≤ i ≤ m and 1 ≤ j ≤ n. (2)
Because of (2), we can infer that the product of two matrices, no matter what dimensions each matrix may have, is not <em>commutative</em> because of the nature and characteristics of the definition itself, which implies operating on a row of the <em>former</em> matrix and a column of the <em>latter</em> matrix.
Such <em>"arbitrariness"</em> means that <em>resulting</em> value for will be different if the order between and is changed and even the dimensions of may be different. Therefore, the proposition is false.
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To solve this you have to do 3912/2 which is 1956. Since Thursday is 40 dollars less you have to subtract 40 for Thursday and add 40 for Sunday. So, Thursday brought in 1916 and Sunday brought in 1996. To check your work add 1996 and 1916 and make sure they equal 3912, which they do.