which represents an exterior angle of triangle xyz?\n∠lxz\n∠jxm\n∠jxz\n∠hxj

Brief Explanations:

An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side.

• $\angle LXZ$: This angle is not formed by a side of $\triangle XYZ$ and an extension of an adjacent side.
• $\angle JXM$: This angle is not related to the sides of $\triangle XYZ$.
• $\angle JXZ$: This angle is formed by side $XZ$ of $\triangle XYZ$ and the extension of side $XY$ (since $XM$ is an extension).
• $\angle HXJ$: This angle is not formed by a side of $\triangle XYZ$ and an extension of an adjacent side.

Answer:

$\angle JXZ$