The three answers you have are correct. The last fourth answer is coincidentally "angle 4". If another number other than '4' was in the diagram, then you would label it as angle X (replace X with that number in question).
note: you can say "angle 4" or you can use the angle markers as you have been doing. It's probably best to stay consistent.
Answer:
-17
Step-by-step explanation:
-4x-17+x=-3x+----
-3x-17=-3x+---
-3x-17=-3x+(-17)
Answer:
A
Step-by-step explanation:
20.7
If 90 equals to (x+2) and (x-6), then (x+2)=(x-6), which is impossible because 2≠-6
