Answer:
option A
Step-by-step explanation:

Answer:
A. ZA+ZB =180
B. ZA is 135 and ZB is 45
Step-by-step explanation:since ZA and ZB are supplementary
ZA+Zb =180°
But ZA=3ZB
∴ 3ZB+ZB=180° ⇒4ZB=180°
∴ZB =45
Answer: 
Step-by-step explanation:

You can't find a value of x since there is no equal sign. This is not an equation. It is just an expression, so you can't solve it for x.