Catchase3340 Catchase3340 20-02-2024 Mathematics contestada (1 point) How many free variables does each augmented matrix have? a. \( \left[\begin{array}{lll|l}1 & 7 & 2 & 5 \\ 0 & 0 & 0 & 0\end{array}\right] \) a. b. \( \left[\begin{array}{rr|r}1 & 0 & 2 \\ 0