Answer:
x = 58.5°
Step-by-step explanation:
Given is an irregular pentagon.
Sum of all the interior angles of an regular or irregular pentagon is always 540°.
[tex]73° + 143° + 90° + 3x + x = 540°\\
306° + 4x = 540°\\
4x = 540° - 306°\\
4x = 234°\\
x = \frac{234 \degree}{4} \\ x = 58.5 \degree[/tex]
