We know that WZ is a line, and all lines measure 180 degrees.
Therefore, Angle PWX + Angle PYX + Angle PYZ = 180 degrees. Plug in what we know:
[tex]\sf 25\textdegree + 85\textdegree +x=180\textdegree[/tex]
Simplify:
[tex]\sf 110\textdegree +x=180\textdegree[/tex]
Subtract 110 to both sides:
[tex]\sf x=70\textdegree[/tex]
So angle PYZ is 70 degrees.
Angle ZX is equal to Angle PYX + PYZ.
[tex]\sf 85\textdegree +70\textdegree =\boxed{\sf 155\textdegree}[/tex]
