given l || m || n, find the value of x.

Answer:

$x = 42$

Explanation:

Step1: Identify angle - relationship

Since $l\parallel m\parallel n$, the angles marked $x^{\circ}$ and $42^{\circ}$ are corresponding angles.

Step2: Apply corresponding - angles property

Corresponding angles formed by parallel lines are equal. So $x = 42$.