12) Let \( A \) be a square matrix whose characte equation is given by \( \lambda^{4}+7 \lambda^{3}-5 \lambda+1 \) what is \( \operatorname{det}(A) \) ?

Question simplify: \( \sqrt[3]{\frac{625 u^{5}}{y^{12}}} \)

9) \( \frac{x^{2}+7 x+6}{x+1} \div \frac{10 x+60}{x+1} \) \( \begin{array}{ll}\text { A) } x-5 & \text { *B) } \frac{x+1}{10} \\ \text { C) } \frac{10 x}{x+9} & \text { D) } x-1\end{array} \)

Solve \( 4 n+6=-42 \) Solve \( -10 r-5=4 n \)

2) Eduardo ran 26 kilometers less than Jennifer last week. Eduardo ran 18 kilometers. How many kilometers did Jennifer run?

True or false \( 4: 3 x=32: 72 \) if \( x=3 \)