diff --git a/3_equ-tab-figs/1_equations/main.tex b/3_equ-tab-figs/1_equations/main.tex
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+\documentclass{article}
+\usepackage[utf8]{inputenc}
+\usepackage[english]{babel}
+\usepackage{amssymb,amsmath}
+
+\begin{document}
+\section{Simple equations on text}
+\label{sec:eq-text}
+
+Here you can see simple equations along with text $x$, $y$ and \(z\) are in math mode. This mode is known as \textbf{inline} mode and it is recommended to write short equations like: $-10 \leq x \leq 10$. Thus, if complex and long equations are required, it is recommended to use the equation environment.\par
+
+\section{Equation environment}
+\label{sec:environment}
+
+Here we can find a way to write long equations like \eqref{eq:fraction}:
+\begin{equation}
+  \label{eq:fraction}
+  f(t)=\sqrt{\frac{t-a}{t+a}}
+\end{equation}
+\noindent here $t$ is time in seconds.
+
+More complex equations can be written using symbols and commands from math-mode. An example is the Fourier coefficients equations \eqref{eq:a0},\eqref{eq:an} and \eqref{eq:bn}:
+\begin{eqnarray}
+  a_0=\frac{1}{T}\int_0^T f(t)dt  \label{eq:a0}\\
+  a_n=\frac{2}{T}\int_0^T f(t)\cdot \cos{\left(\frac{2\pi nt}{T}\right)}dt  \label{eq:an}\\
+  b_n=\frac{2}{T}\int_0^T f(t)\cdot \sin{\left(\frac{2\pi nt}{T}\right)}dt  \label{eq:bn}
+\end{eqnarray}
+
+Previous equations are used to define the Fourier series as:
+\begin{equation}
+  \label{eq:fourier}
+  g(t)=a_0+\sum_{m=1}^{\infty}a_m \cos{\left(\frac{2\pi mt}{T}\right)}++\sum_{m=1}^{\infty}b_n \sin{\left(\frac{2\pi nt}{T}\right)}
+\end{equation}
+\end{document}
+
+
+
+
diff --git a/3_equ-tab-figs/2_figures/main.tex b/3_equ-tab-figs/2_figures/main.tex
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+\documentclass{article}
+\usepackage{amsmath}
+\usepackage{graphicx}
+\begin{document}
+\section{Simple figures}
+\label{sec:simple}
+
+This is a simple figure; see \figurename{} \ref{fig:fig-example}.
+\begin{figure}[!htb]
+  \centering
+  \includegraphics[width=3.5in]{example-image-a}
+  \caption{Figure's caption.}
+  \label{fig:fig-example}
+\end{figure}
+\end{document}
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