EQUATION & INEQUALITY X2
The entry in the 2nd row, 3rd column
| 1 | 3 | 2 |
| -1 | 5 | 7 |
| 10 | 0 | 8 |
The determinant of
| 1 | -3 | 4 |
| -1 | 5 | 2 |
| -2 | 3 | 4 |

The inverse of
| 3 | 5 |
| -3 | -5 |
What is does not exist?
Find f(12) when
f(x) = -x if x<3 x-6 if 3< x <12 x if x >12

A=
| 3 | 5 |
| -3 | 5 |
| 0 | 4 |
B=
| 1 | -1 | 1 |
| 2 | 5 | -5 |
A=
| 1 | -1 | -1 |
| 2 | 5 | 5 |
B=
| 2 | 6 |
| -3 | 5 |
| 7 | 0 |
| 14 | 28 | 28 |
| 7 | 28 | 28 |
| 7 | -7 | -7 |