posted by samuel .
the bearing of Y from X is 160¤ and the bearing of Z from Y is 060¤. find the bearing of X from Z.
The bearing to a point is the angle measured in a clockwise direction from the north line.
In your case,
The bearing of X from Y is -160¤ and the bearing of Z from Y is 060¤.
Z is 220 degrees bearing from X.
X is -220 deg. bearing from Z. That is the same as +140 deg from Z