Answer:
161 - 6x
Step-by-step explanation:
3 angles in a triangle all add up to 180 degrees so:
180 - (4x + 18 + 2x + 1)
180 - (4x + 2x + 18 + 1)
180 - (6x + 19)
180 - 6x - 19
180 - 19 - 6x
161 - 6x = your third angle
Let me know if you wanted to find x or if I've done anything wrong!
