The image you uploaded contains the following mathematical problems:

1. Matrix Operations: You are asked to compute the expression $3A^T + 2AB$, where:

   • $A = \begin{pmatrix} 8 & 7 & 6 \\ 2 & 1 & 0 \end{pmatrix}$
   • $B = \begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{pmatrix}$

2. Determinant Calculation: You are asked to calculate the determinant of the matrix:

   -6 & -8 & 3 \\ 4 & -3 & -1 \end{pmatrix}$$

If you'd like me to solve them in detail, just let me know!