QUESTION 8 Calculate the determinant $|A| = \begin{vmatrix} 5 & -3 \\ x & 10 \end{vmatrix}$ where x=8. QUESTION 9 Given matrix $A = \begin{bmatrix} 5 & 1 & 2 \\ 0 & 2 & 1 \\ 1 & 3 & 1 \end{bmatrix}$, calculate the cofactor $C_{31}$
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