Use a calculator to approximate the exponential expression to 4 decimal places. \( e^{4} \) \( e^{4} \approx \square \) (Round to four decimal places as needed.)

What is \( 3 / 4 \) of \( 12 ? \)

Arrange the following numbers in the descending order \( 8,42,312,8,42,321, \quad 8,43,221,8,43,212,8,4,222 \)

Trasform in percen a) \( \frac{2}{3} \) b) \( \frac{4}{55} \)

It takes 48 workers to complete three quarter of a certain job in 15 days. If the remaining job needs to be completed in 12 days, how many workers need to be deployed?

2. Realiza las siguientes operaciones con paréntesis y números enteros. \( \begin{array}{l}\text { a })-(+7)+(+12)-(-10)+8-13+9-(-15)= \\ (b)+6+13-9-(+15)+(-21)-7-(-32)= \\ (c)+(+11)-(+39)-17+(-20)+(-8)+3= \\ (d)-(+9)+(+5)-(-4)-11-3-(-13)= \\ (e)+21-(-25)+19+(+8)-(-44)+10= \\ (f)-11+16+(-100)-45-(+8)-320= \\ (g)+7+12+(+8)-(+13)-16+(-92)-1= \\ (h)-(+41)-15+(-13)-100-21+(-6)+2= \\ (i)-(-31)+11-15-(-9)+17+2-(+78)= \\ (j)-(-1500)+500-2000-(+100)+4000-20=\end{array} \)