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\begin{center}
  \begin{tikzpicture}
    \begin{scope}
      \def\sep{2.8cm}
      \node [draw, text width=5cm, align=left, rounded corners=2pt] (y lt t) at (0,0) {\footnotesize{Karen's students are about to take a standardized test. Karen gets a \$500 bonus if their average score is above 75, plus an extra \$10 bonus for every additional point the average score increases above 75. So far, Karen has graded 8 tests, and the average is 70. Given that each student can have a maximum score of 150, what combined score do the last two tests need to have for Karen to earn a \$600 bonus?}};

      \node [anchor=west,draw, text width=7.5cm, align=left, rounded corners=2pt,minimum width=8cm] (y gt t 1) at ([xshift=1.5cm,yshift=\sep/2]y lt t.east) {\footnotesize{First subtract \$500 from Karen's goal bonus amount to find how much she makes from the extra ... \\ Then divide the extra bonus by the extra rate: ...\\ Then ... : 850 points - 560 points = 290 points \\ \#\#\#\# $\boxed{290}$\\}};
      \node [anchor=south] at (y lt t.north) {$\mathbf{x}$};
      \node [anchor=south east, draw,fill=black!5!white] (reward) at (y gt t 1.south east) {\footnotesize{\textbf{Reward: 6}}};

      \node [anchor=west,draw, text width=7.5cm, align=left, rounded corners=2pt,minimum width=8cm] (y gt t 2) at ([xshift=1.5cm,yshift=\sep*3/2]y lt t.east) {\footnotesize{To determine the combined score required for the last two tests in order for Karen to earn a \$600 ... \\ Since she wants to earn a total of \$600 ... \\ ... Thus, to summarize, the combined score needed on the last two tests for Karen to earn a \$600 bonus is: $\boxed{290}$\\}};
      \node [anchor=south east, draw,fill=black!5!white] (reward) at (y gt t 2.south east) {\footnotesize{\textbf{Reward: 8}}};
      \node at ([xshift=-.1cm,yshift=.1cm]reward.south east) {\textcolor{ugreen}{\faCheck}};

      \node [anchor=west] (y gt t cdots) at ([xshift=1.5cm,yshift=-\sep/2]y lt t.east) {\LARGE$\cdots$};
      
      \node [anchor=west,draw, text width=7.5cm, align=left, rounded corners=2pt,minimum width=8cm] (y gt t 4) at ([xshift=1.5cm,yshift=-\sep*3/2]y lt t.east) {\footnotesize{The total bonus from the first 8 tests is \$500 x 8 = \$4000. \\ The average score needs to be at least 75 ... \\ So the minimum possible score for these 2 tests is 85 x 2 = 170. \\ To find the combined score needed for all 10 tests ... \\ Therefore, the combined score needed for Karen to earn a \$600 bonus is 1370. \\ The answer is $\boxed{1370}$}\\};
      \node [anchor=south east, draw,fill=black!5!white] (reward) at (y gt t 4.south east) {\footnotesize{\textbf{Reward: -3}}};

      \draw [->] (y lt t.east) .. controls +(+1cm,0) and +(-1.5cm,0) .. (y gt t 2.west) node [anchor=south east] {$\mathbf{y}_{1}$};
      \draw [->] (y lt t.east) .. controls +(+1cm,0) and +(-1.5cm,0) .. (y gt t 1.west) node [anchor=south east] {$\mathbf{y}_{2}$};
      \draw [->] (y lt t.east) .. controls +(+1cm,0) and +(-1.5cm,0) .. (y gt t cdots.west);
      \draw [->] (y lt t.east) .. controls +(+1cm,0) and +(-1.5cm,0) .. (y gt t 4.west) node [anchor=south east,yshift=.5cm,xshift=.1cm] {$\mathbf{y}_{N}$};
      
    \end{scope}
  \end{tikzpicture}    
\end{center}
