Step-by-step explanation:

Answer:
15
Step-by-step explanation:
Answer:
-17 =s
Step-by-step explanation:
-8s +4 = -7s +21
Add 8s to each side
-8s+8s +4 = -7s+8s +21
4 = s+21
Subtract 21 from each side
4-21 = s+21-21
-17 =s
Answer:
I believe it's A
Step-by-step explanation:
I'm not sure sorry if its wrong
The angle on a line is 180°
The sum of the three given angles is 180°:

Use this equation to find the value of x:

Then, the value of x is 25