(b) Afer the meal, Caleb and Jean continued driving and reached Kuala Lumpor at 1323 Calculate the average speed for the whole journey.

2. There are only red marbles and green marbles in a bag. There are 5 red marbles and 3 green marbles. Dwayne takes at random a marble from the bag. He does not put the marble back in the bag. Dwayne takes at random a second marble from the bag.

1. Выберите выражение, тождественно равное выражению \( 2 m+n \) : \( \begin{array}{ll}\text { а) } 2 m-n ; & \text { б) } 2 m n ; \\ \text { в) } n+2 m ; & \text { г) } m+2 n\end{array} \)

1) Déterminer en extension l'ensemble \( A \) défini par: \[ A=\left\{x \in \mathbb{Z} / \frac{x^{2}-x+2}{2 x+1} \in \mathbb{Z}\right\} \] 2) Déterminer en extension les ensembles suivants: \( E=\left\{\frac{\pi}{10}+\frac{k \pi}{5} /|k-1| \leq 3\right. \) et \( \left.k \in \mathbb{Z}\right\} \) \( F=\left\{\cos \left(\frac{\pi}{10}+\frac{k \pi}{5}\right) / k \in \mathbb{Z}\right\} \)

3. \( 74,5: 5 \)

NÚMEROS RACIONALES: RESOLVER \( \begin{array}{ll}\text { 1) } \frac{3}{5}+\left(-\frac{6}{5}\right)= & \text { 4) }-\left(-\frac{8}{10}\right)+\left(-\frac{7}{30}\right)= \\ \text { 2) }-\frac{8}{3}-\left(-\frac{9}{4}\right)= & \text { 5) }-\left(+\frac{2}{7}\right)-\left(-\frac{5}{2}\right)= \\ \text { 3) }-\frac{5}{6}+\left(-\frac{1}{2}\right)= & \text { 6) } \frac{5}{12}+\left(-\frac{2}{3}\right)-\left(-\frac{3}{24}\right)=\end{array} \)