Respuesta :

Answer:

To find the missing angle, we need to find x.

[tex]3x + 2x - 10 = 180\\\\5x - 10 = 180\\\\5x = 190\\\\x = 38[/tex]

Now, we plug in what we got for x into 3x.

[tex]3(38)\\\\114[/tex]

The value of 3x is 114.