12 A jet plane made a 4000 km trip with the wind, in 4 hours, but required 5 hours to make the return trip. Given that the speed of the wind was constant throughout, the entire trip, what was the speed of the wind and what was the average speed of the plane in still air?

EJ. 2) a) Estudiar la presencia de asíntotas verticales y horizontales de la función: \( \mathrm{f}(\mathrm{x})=\frac{4 x-1}{\sqrt{4 x^{2}}} \); señalando sus respectivas ecuaciones si las hubiera. b) Esbozar una representación gráfica de la misma.

\( \left. \begin{array} { l } { 2 ^ { n } = 3 ^ { m } = 5 ^ { a } = x } \\ { \frac { 1 } { n } + \frac { 1 } { m } + \frac { 1 } { a } = \frac { 1 } { 2 } } \end{array} \right. \Rightarrow x = 0 \)

\begin{tabular}{l} Question: \\ Read the case study below and answer the following question: \\ \( \qquad \) Workforce diversity in South Africa. \\ The composition of the South African workforce is becoming increasingly diverse across variou: \\ primary and secondary categories. Diversity includes more than just cultural or ethnic differences; \\ also encompasses age, gender, sexual orientation, and physical abilities, which represent priman \\ categories of diversity. \\ It is, therefore, unsurprising that managing diversity issues has emerged as a central focal point o \\ human resource development practices within the country. \\ \hline\end{tabular}

Al prodotto dei numeri 7 e 6 si sottrae la differenza dei numeri 4 e 3 .

3) \( \frac{a^{3} b-a b^{3}}{a b^{2}-a^{2} b}= \)