the rest of the question say find the length of the whole secant of the bottom

According to the Intersecting Secants Theorem,
[tex]\begin{gathered} x\times6=(12+8)\times8 \\ 6x=20\times8 \\ x=\frac{80}{3} \\ x=26.\bar{66} \\ x\approx26.67 \end{gathered}[/tex]Thus, the first option is the correct choice.