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Matrices | Adjoint and Inverse of a Square Matrix

if \(A= \begin{bmatrix} a & b\\ c & d \end{bmatrix}\), then adj (AT) - (adj A)T is
If A is a square matrix such that A2 = I where I is the identity matrix, then what is A-1 equal to?
If A is a square matrix, then what is adj (A-1) – (adj A)-1 equal to?
If A and B are two invertible square matrices of same order, then what is (AB)-1 equal to?
If |A| = 4, where A is a square matrix of order 4, then what is |Adj A| equal to?
If |A| = 8, where A is a square matrix of order 3, then what is |Adj A| equal to?
 If |A| = 7, where A is square matrix of order 3, then what is |adj (A)| equal to ?
If A is a square matrix, then what is adj AT - (adj A)T equal to? 
If a matrix A is such that 3A3 + 2A2 + 5A + I = 0 then what is A-1 equal to?
If a matrix A has inverses B and C, then which one of the following is correct?
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