Answer:
x = 25
Step-by-step explanation:
Both angles are supplementary. It means that the sum of both angles is equal to 180°, so we can write the following equation:
2x + 10 + 4x + 20 = 180
Now, we need to solve for x, so adding like terms, we get:
6x + 30 = 180
Subtracting 30 from both sides:
6x + 30 - 30 = 180 - 30
6x = 150
Dividing by 6, we get:
6x/6 = 150/6
x = 25
Therefore, the answer is x = 25