Hello!
To evaluate the expression [tex]\sf{\cfrac{y+xz}{2}}[/tex], we should plug in the values of every variable:
[tex]\begin{aligned} \sf{\frac{8+6\cdot3}{2}}\\\sf{\frac{8+18}{2}} \\\sf{\frac{26}{2}} \\\bf{13}\end{aligned}[/tex]
Therefore the answer is 13.
Hope that helps! :)
-art lover
