the system of equations using matrices (row operations). \( -x+y+z=-1 \) \( -x+3 y-7 z=-13 \) \( 6 x-5 y-10 z= \)

5) \( (x+2)^{4}-4(x+2)^{2}-5=0 \)

1. \( \frac{4 x+5}{13}=\frac{8}{9} \)

b) \( 5^{0}+\frac{1}{3} \cdot\left[\left(3-\frac{1}{5}\right) \cdot 5^{-2}+2 \cdot\left(1-\frac{2}{5}\right)^{3}\right]: \frac{4}{3} \)

For the following system to be consistent, \( \left\{\begin{array}{l}6 x_{1}-3 x_{2}-2 x_{3}=-6 \\ 5 x_{1}-8 x_{2}+k x_{3}=-4 \\ -7 x_{1}+4 x_{2}+7 x_{3}=8\end{array}\right. \) we must have \( k \neq \square \) You may enter your answer as a fraction.

\( \log _{3}(2 x-5)=-2 \) Simplify your ansh