Each exterior angle of a regular decagon has a measure of (3x + 6)°. What is the value of x

Answer 1

X is 46

Answer 2

the exterior angles of a decagon are all 360/10 = 36°

So,
3x+6 = 36
x = 10

For the interior angles (each 144°),
3x+6 = 144
x = 46