Linear algebra/Determinant quiz

1

The determinant of $\left[{\begin{array}{c c}3&4\\2&1\end{array}}\right]$ is .

2

The determinant of $\left[{\begin{array}{c c}0&-2\\6&2\end{array}}\right]$ is .

3

The determinant of $\left[{\begin{array}{c c c}3&-2&-1\\1&1&-2\\8&-5&3\end{array}}\right]$ is .