Question

x=

blank 1:

Explanation:

Step1: Identify angle - pair relationship

The two vertical lines are parallel. Angle $x$ and the $99^{\circ}$ angle are corresponding angles.

Step2: Apply corresponding - angles property

Corresponding angles formed by parallel lines and a transversal are equal. So $x = 99^{\circ}$.

Answer:

$99^{\circ}$