Answer:
The answer is 30
Step-by-step explanation:
A triangle equals 180, so to find out the value X, first you need the other corner. You know that one side of that line is 100, and it is a straight angle. So the other side is 80. 80 + 70 = 150. To get 180, you need to add 30 to that 150, therefore the answer is 30.
