A matrix A of order 3 × 3 has determinant 5. What is the value of |3A|?

If A = [a_ij] is a 3 × 3 scalar matrix such that a₁₁ = 2, then write the value of |A|.

If I₃ denotes identity matrix of order 3 × 3, write the value of its determinant.

On expanding by first row, the value of the determinant of 3 × 3 square matrix A = [a_ij] is a₁₁C₁₁ + a₁₂C₁₂ + a₁₃C₁₃, where C_ij is the cofactor of a_ij is the cofactor of a_ij in A. Write the expression for its value of expanding by second column.

Let A = [a_ij] be a square matrix of order 3 × 3 and C_ij denote cofactor of a_ij in A. If |A| = 5, write the value of a₃₁C₃₁ + a₃₂C₃₂ + a₃₃C₃₃.