1)The first row of -3T.
T[4 -5 2]
[8 -1 3]
answer=[-12 15 -6]
2)The first row of 5P-Q.
P[3 1] Q[4 4]
[-4 0] [12 21]
answer=[11 1]
3)The first row of TV.
T[4 -5 2] V[3 1]
[8 -1 3] [0 2]
[-4 5]
answer=not possible
4)The inverse of matrix R.
R[0 -1/4]
[1 3/4]
answer=not possible