Answer:
D
Step-by-step explanation:
Well there's a theorem about the sum of the interior angles of a triangle that says that the sum is equal to 180°
so we have
[tex](50)+(2x)+(3x-10)=180\\\\50+2x+3x-10=180\\\\(2x+3x)+(50-10)=180\\\\5x+40=180\\\\5x=180-40\\\\5x=140\\\\x=28[/tex]
so it's option D
