This arm is attached to a wall on the left. The right end is free hanging. Each section is $1\mathrm{.}1$ m wide and $3\mathrm{.}4$ m high.

If the force at the end of the arm is $\backslash (\backslash$mathrm$\{$F$\}=170\mathrm{.}0\backslash$mathrm$\{$~N$\}\backslash ),$ what is the force in member $9?$ Use the Method of Sections.

Use a positive number if it is in tension and a negative number if it is in compression.