12. How many students are there in a class if 8 students remain unseated after 3 rows of seats are filled, and 2 students remain unseated after 4 rows of seats are filled, knowing that all the rows are the same? a) 24 b) 26 c) 38

e) \( \sqrt[2]{2} \cdot \sqrt[2]{18}= \)

Analizar y graficar 3) \( y=2 x^{2}-4 x+5 \)

d) \( \frac{3^{4}: 3}{3^{2}}= \)

Calaula las saguientes determinantes \( \begin{array}{ll}\text { a) }\left|\begin{array}{cc}-8 & 9 \\ -1 & 20\end{array}\right| & \text { b }\left|\begin{array}{ll}2 & \frac{1}{3} \\ \frac{1}{2} & -1\end{array}\right| \text { c) }\left|\begin{array}{cc}5 & -a \\ 2 a & 4 a^{2}\end{array}\right|\end{array} \)

Сложите почленно неравенства. \( 11<13 \) и \( 5,1>2,7 \)