How to write an explanation for a formula in LaTeX?

Question

TeX

Hello.
I have the following formula with explanations written in Word:

I want to transfer this formula and its explanation to LaTeX. The formula itself in LaTeX I depicted as follows:

\begin{equation}
  \bar y = \frac{\sum(y_i \times t_i)}{\sum t_i},
\end{equation}

How to add an explanation of signs (symbols) to this formula in the same style as in the figure above?

Answer 1

\begin{minipage}[h]{1\textwidth}
\begin{equation}
\overline{K_p} = \sqrt[n]{\prod K_\textup{chain}},
\end{equation}
\begin{tabular}{llll}
    where & $\overline{K_p}$ & {---} & coefficient of growth; \\
    \addlinespace
    & $K_\textup{chain}$ & {---} & \begin{tabular}[t]{@{}[email protected]{}}chain coefficients of growth;\end{tabular} \\
    \addlinespace
    & $n$ & {---} & \begin{tabular}[t]{@{}[email protected]{}}number of chain coefficients.\end{tabular}
\end{tabular}
\end{minipage}