Find the minor of the element 8 in the following determinant: Δ = | 1 4 6 | | 2 5 9 | | 8 7 12 |

If the determinant 1tt2t3t1tt2t2t1tt3t2t1 = (1 - a(t))p, find a(t) and p.

If matrix A is a 3 × 3 matrix and det(A) = 5, then find the value of det(2A).

Let A be a 3 × 3 matrix. If det(A) = -12, then det(3A) = ________.