For questions 1 and 2, use the matrices below:
A=[17 2 3]
[11 4 -9]
B=[10 6 -7]
[-4 3 0]
C=[1]
[2]
[-2]
1)Find A-B
[17-10] [2-6] [3--7]
[11--4] [4-3] [-9-0] =[7 -4 10]
[15 1 -9]
2)Find BC, if possible.
10(-1) 6(2) -7(-2)
-4(-1) 3(2) 0(-2) =[-10 12 14]
[4 6 0]
(I hope this posts right)