\documentclass[12pt]{article}
\usepackage{amsmath, amssymb, graphicx, array, fancyhdr, unicode-math, multirow}

\DeclareMathOperator{\Var}{Var}
\DeclareMathOperator{\sd}{SD}
\DeclareMathOperator{\Pois}{Pois}
\DeclareMathOperator{\Bin}{Bin}
\DeclareMathOperator{\NegBin}{NegBin}
\DeclareMathOperator{\sech}{sech}


% Text: Calibri, all bold
\setmainfont{Calibri}
\renewcommand{\seriesdefault}{b}

% Math: choose a math font and visually embolden it
\setmathfont{TeX Gyre Termes Math}                  % base math font
\setmathfont[FakeBold=1.9]{TeX Gyre Termes Math}    % embolden; adjust 1.6–2.4

% header
\pagestyle{fancy}
\fancyhf{}
\lhead{\resizebox{!}{2cm}{A}}
\chead{\raisebox{0.5cm}{\Huge Set Operations}} % (add title text if you want)
\rhead{\resizebox{!}{2cm}{A}}
\setlength{\headheight}{2.5cm}
\setlength{\headsep}{12pt} % space between header and body

\begin{document}
\thispagestyle{fancy}

% -------- PAGE 1 --------
\begin{table}[h!]
  \renewcommand{\arraystretch}{1.2}

  % -------- Single -------------------
  \begin{tabular}{m{1.2in} m{2in} m{2in}}
   \includegraphics[width=1in]{images/single.png} 
     & $\includegraphics[width=2in]{images/pair.png}$ 
     & $\includegraphics[width=2in]{images/triad.png}$ \\
  \end{tabular}

  % -------- Abstract -------------------
\begin{tabular}{m{1.2in} m{4in}}
\multirow{5}{*}{\centering\includegraphics[width=1in]{images/abstract.png}} &
$|X \cup Y| = |X| + |Y| - |X \cap Y| = |U| - |X^{C} \cap Y^{C}|$ \\
& $|X \cap Y| = |X| + |Y| - |X \cup Y| = |U| - |X^{C} \cup Y^{C}|$ \\
& $|A \cup B \cup C| = |A| + |B|+ |C| - |A \cap B| - |B \cap C| - |A \cap C| +|A \cap B \cap C|$ \\
& $|A \cap B \cap C| = - |A| - |B| - |C| + |A \cup B| + |B \cup C| + |A \cup C| +|A \cup B \cup C|$\\
& $|A\cap B| = |A \cap B \cap C^{c}| + |A \cap B \cap C|$\\
\end{tabular}

% -------- Question -------------------
\begin{tabular}{m{1.2in} m{4in}}
\centering\includegraphics[width=1in]{images/question.png} &
\centering\includegraphics[width=4in]{images/Three_set.png} 
\end{tabular}
\begin{tabular}{m{1.2in} m{4in}}
&$|U| = 60 : |T| = 45 : |N| = 30 : |X| = 5$\\
&$|T  \cup N| = ?$\\
&$|T  \cap N| = ?$\\
\end{tabular}
\end{table}

% -------- PAGE 2 --------
\newpage
\thispagestyle{fancy}

\begin{table}[h!]
  \renewcommand{\arraystretch}{1.2}
 % -------- Answer -------------------
\begin{tabular}{m{1.2in} m{4in}}
\includegraphics[width=1in]{images/key.png} &
\includegraphics[width=4in]{images/Three_set} \\
&$|U| = 60$\\
&$|T| = 45$\\
&$|N| = 30$\\
&$|X| = 5$\\
&$|T  \cup N| = |U| - |X| = 60 - 5 = 55$\\
&$|T  \cap N| = |T| + |N| - |T \cup N| = 45 + 30 - 55 = 20$\\
\end{tabular}
\end{table}
 
\end{document}