After Batman brought the Joker to justice, the crime rate in Arkham City decreased by \( 12 \% \). Previously, the crime rate was \( c \) incidents per 1000 people. Which of the following expressions could represent the crime rate in Arkham City after Batman brought the Joker to justice? Choose 2 answers: A \( 0.88 c \) B \( 0.12 c \) C \( c-0.12 \)

Solve. \( \begin{array}{l}-3 x-5 y=5 \\ 5 x+5 y=15\end{array} \) \( (\square, \square) \) Submit

Resuelve el siguiente sistema de ecuaciones lineales por el método de sustitución, eliminación y igualación: \[ \begin{array}{c}3 x-2 y=7 \\ x+y=4\end{array} \]

6. \( \begin{aligned} x+y+z & =0 \\ 3 x+2 y-2 z & =0 \\ 4 x+3 y-z & =0 \\ 6 x+5 y+z & =0\end{aligned} \)

How many elements are there in a complete solution to \( x^{2}+7 x+2 \equiv 0(\bmod 41) ? \)

Simplify the following expressions fully: \( 1.2 .1 \quad(x+2)\left(x^{2}-x+3\right) \) \( 1.2 .2 \quad \frac{5}{x+3}-\frac{3}{2-x} \) \( 1.2 .3 \quad \frac{25^{-x} \cdot 15^{x+1}}{3^{x} \cdot 5^{-x}} \)