12)
The midpoint of NH can be calculated using the formula:
[tex]M_{NH}=\frac{N+H}{2}...(1)[/tex]
From the graph, we identify:
[tex]\begin{gathered} N=0 \\ \\ H=-6 \end{gathered}[/tex]
Now, using equation (1):
[tex]\begin{gathered} M_{NH}=\frac{0-6}{2}=\frac{-6}{2} \\ \\ \Rightarrow M_{NH}=-3 \end{gathered}[/tex]
According to the graph, this is the point K
