Hallar la molalidad de una solución que contiene 0,5 moles de Kcl disueltos en 250 mi de agua. \( \mathrm{R}=2 \mathrm{~m} \)

Write the complex number \( \frac{3+2 i}{1-4 i} \) in the form \( a+b i \).

\( \left. \begin{array} { c } { 787.827 .179 } \\ { \square } \\ { \square } \end{array} \right. \)

Select all the correct answers. Imagine a car as a model that represents the human body, with its parts performing various functions similar to human body systems. Which two statements are correct analogies? The gas in the car is the digestive system that provides the necessary energy. The frame of the car is the digestive system that provides structure and support to the body. The engine of the car is the digestive system that circulates nutrients to the rest of the body. The oil in the car is the excretory system that protects and coats the body.

Outside temperature over a day can be modelled using a sine or cosine function. Suppose you know the high temperature for the day is 62 degrees and the low temperature of 42 degrees occurs at 7 AM. Assuming \( t \) is the number of hours since midnight, find an equation for the temperature, \( D \), in terms of \( t \). \( D(t)= \)

a) \( \frac{x+\frac{1}{5}}{0, \hat{3}}=\frac{0,6}{3^{-2}} \)