Select the correct answer. A singer's newly announced concert on social media received \( 600 \) mentions in the first week of its announcement. The total number of mentions increases by half every week. Based on this information, after how many weeks since the concert was announced will the total number of mentions increase to about \( 4,556 \) ? A. The total number of mentions will increase to about \( 4,556 \) after \( 3 \) weeks. B. The total number of mentions will increase to about \( 4,556 \) after \( 5 \) weeks. C. The total number of mentions will increase to about \( 4,556 \) after \( 10 \) weeks.D. The total number of mentions will increase to about \( 4,556 \) after \( 4 \) weeks. 

A train leaves New Delhi at 1915 hours and arrives Mathura at 2205 hours. The distance between two stations is 144 km . Find the speed of the train.

\( ( 1 - \frac { 1 } { 2 } ) + ( 2 - \frac { 1 } { 2 } ) + \ldots + ( 10 - \frac { 1 } { 2 } ) = ? \)

Знайди значення виразу зручним способом: \( \begin{array}{ll}\text { 1) }(7895+5149)-4895 ; & \text { 2) }(227+959)-759 ; \\ \text { 3) } 5797-(4797+270) ; & \text { 4) } 1541-(150+541) .\end{array} \)

6. Sergej braucht für seinen 2.1 km langen Nachhauseweg zu Fuss exakt 20 Minuten. Heute fängl es aber heftig an zu regnen und viele Leute rennen schnell ins Trockene. Weil ihm hingegen der Regen gefält, läuft er staftdessen in halbem Tempo weiter und kommt deshalb 8 min späfer zu Hause an. Wie weit ist er gekommen, bevor es angefangen hat zu regnen?

14. Verilmiş ədədlərin natural bölənlərinin sayını tapın. \( \begin{array}{lllll}\text { 1) } 32 & \text { 2) } 65 & \text { 3) } 84 & \text { 4) } 82 & \text { 5) } 120 \\ \text { 6) } 17 & \text { 7) } 42 & \text { 8) } 60 & \text { 9) } 144 & \text { 10) } 51\end{array} \)