Calculate the determinant.
#1. \(\begin{vmatrix} 7 & -7\\3 & 8\\\end{vmatrix}\)
#2. \(\begin{vmatrix} 9 & 45\\-7 & -35\\\end{vmatrix}\)
#3. \(\begin{vmatrix} -10 & -1 & -29\\5 & 1 & 14\\2 & 7 & -1\\\end{vmatrix}\)
Find the inverse of the given matrix or state that it is singular.
#4. \(\begin{bmatrix} -4 & 8\\-1 & 2\\\end{bmatrix}\)
#5. \(\begin{bmatrix} 6 & -8\\3 & -3\\\end{bmatrix}\)
#6. \(\begin{bmatrix} -5 & 5 & -10\\2 & -5 & -5\\-8 & -7 & -61\\\end{bmatrix}\)