\( 41^{\circ} \) Let \( |x|=2 \) and \( |y|=4 \). Calculate \( |3 x| ;|-5 y| ;|-3 x y| ;\left|\frac{5 x}{2 y}\right| \) \( 2^{\circ} \) What is the sign of the following, knowing that \( z \) is a strictly positive number? \( |z| ;|-z| ;-|-z| ; z|z| ;(-z) \times|-z| \)

La cantidad de un material radiactivo disminuye a la mitad cada 10 años. Si comenzamos con 80 gramos, ¿cuánto quedará después de 30 años?

A population of 60 deer are introduced into a wildlife sanctuary. It is estimated that the sanctuary can sustain up to 600 deer. Absent constraints, the population would grow by \( 10 \% \) per year. Estimate the population after one year \( p_{1}= \) Estimate the population after two years \( p_{2}= \)

3 The middle proportional between the two numbers 3 and 12 is ............. \( \begin{array}{llll}\text { (a) } \pm 3 & \text { (b) } \pm 4 & \text { (c) } \pm 6 & \text { (d) } \pm 12\end{array} \)

\( \frac{21}{35}=\frac{}{100} \)

What is \( \sqrt[3]{27} ? \) \( \square \)