Text Formatting ⇒ enumitem | Making List Labels line up

[ghostanime2001]

How can I make (a) line up vertically in this document?

Code: Select all

\documentclass[fleqn]{article}
\usepackage{fullpage}
\usepackage[inline]{enumitem}
\usepackage[margin=1in]{geometry}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{siunitx}
\pagestyle{empty}
\setlength{\mathindent}{0in}
\begin{document}
\begin{enumerate}
\item
\begin{enumerate}
\item
$\begin{aligned}[t]
y(x,t)=0.22\sin(5.6x+34t)
\end{aligned}$
\end{enumerate}
\begin{enumerate*}
\item
$\begin{aligned}[t]
&5.6=\dfrac{2\pi}{\lambda} \\
&\lambda 5.6=2\pi \\
&\lambda=\dfrac{2\pi}{5.6} \\
&\lambda=1.12
\end{aligned}$
\item
$\begin{aligned}[t]
&\omega=2\pi f \\
&\dfrac{\omega}{2\pi}=f \\
&\dfrac{34}{2\pi}=f \\
&5.4=f
\end{aligned}$
\item
$\begin{aligned}[t]
&v=\lambda f \\
&v=(1.12)(5.4) \\
&v=6.048 \\
&\text{negative x direction.}
\end{aligned}$
\item
$\begin{aligned}[t]
&A=0.22
\end{aligned}$
\end{enumerate*}
\end{enumerate}
\end{document}