What is x? (Triangle Theorems)
1. x = 54
2. x = 9
3. x = 24
4. x = 144

Answer:
2. x = 9
Step-by-step explanation:
The sum of the measures of the angles of a triangle is 180°.
6x + 16 + 90 + 20 = 180
6x + 126 = 180
6x = 54
x = 9
Answer: 2. x = 9