Encuentra el número de distintos grupos de tres personas que se pueden formar, a partir de un grupo de 10 personas.

3) Se a velocidade média da reação \( \mathrm{N}_{2}+3 \mathrm{H}_{2} \longrightarrow 2 \mathrm{NH}_{3} \) vale \( 2 \mathrm{mols} / \mathrm{min} \). Quanto é a velocidade média em função de cada participante da reação?

2. List the rational numbers among the following: \( \frac{29}{84} ; 0,165 ; \pi ;-\frac{18}{7} ; 0,44444444 \ldots ;-7,375 ; \sqrt{42} \); \( 6 \frac{1}{2} ; 0,234 \)

\( \begin{array}{lllll}\text { Order from least to greatest. } & 14.23 & 14.2 & \frac{176}{12} & \sqrt{\frac{529}{4}}\end{array} \)

2. Ăn đúng cách

A salesperson earns 4 points for each call made to a potential customer and 7 points for each visit made to a potential customer. Last week, the salesperson earned a total of 526 points. The equation \( 4 x+7 y=526 \) represents this situation. Which is the best interpretation of \( 7 y \) in this context? (A) The number of calls the salesperson made to potential customers last week (D) The total number of points the salesperson earned from calls made to potential (D) The total number of points the salesperson earned from visits made to potential (Dustomers last week