# Algebra(check pt 3)

posted by
**erin**
.

1)The dimensions of ST.

S[7/12 -1/9]

[-1/3 1/9]

T[4 -5 2]

[8 -1 3]

answer=2x3

2)The pair of matrices that are inverses.

P[3 1] Q[4 4] R[0 -1/4]

[-4 0] [12 21] [1 3/4]

S[7/12 -1/9] T[4 -5 2] U[-9 6 4]

[-1/3 1/9] [8 -1 3] [-5 -2 3]

V[3 1]

[0 2]

[-4 5]

answer=S and R

3)Find the value of [15 4]

[-6 -2]

answer=-6

4)Evaluate:[1 4 -1]

[0 3 5]

answer=10