Code: Select all
\documentclass[fleqn]{article}
\usepackage{fullpage}
\usepackage[inline]{enumitem}
\usepackage[margin=1in]{geometry}
\usepackage{graphicx}
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{siunitx}
\pagestyle{empty}
\renewcommand{\labelenumi}{\arabic{enumi}.}
\renewcommand{\labelenumii}{\alph{enumii})}
\newcommand{\la}{\lambda}
\newcommand{\om}{\omega}
\setlength{\mathindent}{0in}
\everymath{\displaystyle}
\begin{document}
\begin{enumerate}[leftmargin=0cm,nolistsep]
\item
\begin{enumerate}[leftmargin=0cm,nolistsep,itemindent=0.566cm]
\item
$\begin{aligned}[t]
y(x,t)=0.22\sin(5.6x+34t)
\end{aligned}$
\end{enumerate}
\begin{enumerate*}
\item
$\begin{aligned}[t]
&5.6=\dfrac{2\pi}{\la} \\
&\la5.6=2\pi \\
&\la=\dfrac{2\pi}{5.6} \\
&\la=1.12
\end{aligned}$
\item
$\begin{aligned}[t]
&\om=2\pi f \\
&\dfrac{\om}{2\pi}=f \\
&\dfrac{34}{2\pi}=f \\
&5.4=f
\end{aligned}$
\item
$\begin{aligned}[t]
&v=\la f \\
&v=(1.12)(5.4) \\
&v=6.048 \\
&\text{negative x direction}
\end{aligned}$
\end{enumerate*}
\end{enumerate}
\end{document}