Find the following expressions, indicating which of the rules in (3) or (4) they illustrate, or give reasons why they are not defined
11. 8C + 10D, 2(5D + 4C), 0.6C - 0.6D 0.6(C- D)
C = [ 5 2] D = [-4 1]
[-2 4] [5 0]
[ 1 0] [ 2 -1]