How many hours on average does it take for \( 50 \% \) of emails to be opened? Select the correct answer then click confirm.

Simplify. \[ \left(v^{3}\right)^{2} \]

Marcos manejó 465 kilómetros en 5 horas. A esta tasa (velocidad), ¿cuántos kilómetros manejará en 12 horas?

Simplify. \( -\frac{7}{20} \div \frac{1}{5} \cdot\left(-\frac{9}{4}\right) \)

Usando logaritmos, encuentren las derivadas de las siguientes funciones \( \begin{array}{lll}\text { a) } y=x^{x+1} & \text { b) } y=t^{\sqrt{t}} & \text { c) } y=(\sqrt{t})^{t} \\ \text { d) } y=(\ln x)^{x} & \text { e) } y=(\cos s)^{s} & \text { f) } y=(\tan x)^{x^{2}+1}\end{array} \)

Stock market crash Bursting of the housing market bubble Collapse of major banks 1 point Which country did the United States declare war on in response to the September 11