The diagram representing the line AB and midpoint D is shown bel;ow.
Therefore, 16=2x+6.
[tex]\begin{gathered} 2x=10 \\ x=5 \end{gathered}[/tex]
Then, the magnitude of AD will be,
[tex]\begin{gathered} AD=(2\times5)+6 \\ AD=16 \end{gathered}[/tex]
Therefore, the answer is 16.
