Respuesta :

Answer:

x = 63.34 degree

Step-by-step explanation:

2x-10 + x = 180 as al straight lines add up to 180 degrees

3x -10 = 180

+ 10        +10

3x = 190     add 10 to both sides  as shown to cancel left side

x = 190/3

x = 63.33334  degree to 5 dp

x = 63.34 degree to 2 dp.