Short-term, highly liquid investments qualify as cash equivalents when they meet two key criteria:
Maturity Requirement: Typically, only investments with an original maturity of 3 months or less from the date of acquisition qualify as cash equivalents.
If \[ A = \begin{bmatrix} 1 & 2 & 0 \\ -2 & -1 & -2 \\ 0 & -1 & 1 \end{bmatrix} \] then find \( A^{-1} \). Hence, solve the system of linear equations: \[ x - 2y = 10, \] \[ 2x - y - z = 8, \] \[ -2y + z = 7. \]