I don't get it. Explain please!

Answer:
Answer is x= 20 degrees.
Given lines are perpendicular
therefore sum of the angels = 90 degrees
Step-by-step explanation:
[tex]x + 3x + 10 = 90 \\ 4x + 10 = 90 \\ 4x = 90 - 10 \\ 4x = 80 \\ therefore \: x = 20 \: degrees[/tex]
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Answer:
20
Step-by-step explanation:
Complementary angles add up to 90
x + 3x + 10 = 90
4x = 80
x = 20°