Answer:C12=-3, C31=0, C22=0+5
Step-by-step explanation:
Matrix is the arrangement of elements in ROWS and COLUMNS
ROWS is the horizontal arrangement of elements.
Columns is the vertical arrangement of elements.
So in th matrix C
C12 means element of matrix C located at the point of intersection between first row and second column
C31 means element of matrix C located at the point of intersection between third row and first column
C22 means element of matrix C located ad the point of intersection between second row and second column.