If $$\left[ {\matrix{ x & { - 3i} & 1 \cr y & 1 & i \cr 0 & {2i} & { - i} \cr } } \right] = 6 + 11i$$, then what are the values of x and y respectively?

If A is an identity matrix of order 3, then its inverse (A^$$-$$1)

A is a square matrix of order 3 such that its determinant is 4. What is the determinant of its transpose?

If

 $\begin{bmatrix} x & 1 & 1 \end{bmatrix} \begin{bmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{bmatrix} \begin{bmatrix} 1 \\ 1 \\ x \end{bmatrix} = \begin{bmatrix} 45 \end{bmatrix}$

then which one of the following is a value of x?