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\documentclass[11pt]{article}
\usepackage{graphicx,latexsym,amsfonts,amssymb,amsmath,verbatim,theapa,lscape, multirow,
xcolor, booktabs, upgreek, caption}
\begin{document}
Similarly, the competitive marginal offers [\begin{math}\left(
{{\rm{start \!-\!up \;fee}} + {\rm{price \;per \;unit}} \times
{\rm{2}}} \right) \div 2 \end{math}] would have to be 20 during the
off-peak periods, 172 during the peak periods and 93 during the
shoulder 2 periods.
\end{document}