\documentclass{article}

\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage{graphicx}


\begin{document}
\begin{enumerate}
\item Graph $f(x)=2-|x|$ in the
interval $-1\le x\le 3$. Compute $\int_{-1}^3 f(x)\,dx\,$.

\item Graph $g(x)=\bigr|2-|x|\bigr|$ in the
interval $-1\le x\le 3$. Compute $\int_{-1}^3 g(x)\,dx\,$.

\item Graph $h(x)=|2-x|$ in the
interval $-1\le x\le 3$. Compute $\int_{-1}^3 h(x)\,dx\,$.

\end{enumerate}
\end{document}