Answer:
50°
Step-by-step explanation:
Given figure is a quadrilateral. Sum of the measures of all the angles of a quadrilateral is 360°.
Therefore,
[tex](x + 10 )\degree + 2x \degree + x\degree + 3x\degree = 360 \degree \\ \\ (7x + 10 )\degree = 360 \degree \\ \\ 7x + 10 = 360 \\ \\ 7x = 360 - 10 \\ \\ 7x = 350 \\ \\ x = \frac{350}{7} \\ \\ x = 50[/tex]
