Angles on a straight line add up to 180 degrees so
45 + 3x = 180
Subtract 45 from both sides to remove the 45 on the left
3x = 135
Then divide both sides by 3
x = 45
Answer is X = 45
Answer:

Step-by-step explanation:
Let's write this out as an equation. Let the unknown quantity be x:

Answer:
105
the whole triangle adds up to 180
72+3=75
180-75=105
Answer:
The sign would remain the same.
It would have the same value.
ED2021
Answer:
x>-5
Step-by-step explanation: