Answer: Choice A) 35
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Step-by-step explanation:
Let y be the unmarked angle to the right of (x+85). Since angle (x+85) and angle y form a straight angle, we know that (x+85)+y = 180.
We also know that y = 60 since line a is parallel to line b, and corresponding angles are congruent when we have parallel lines.
So (x+85)+y = 180 updates to (x+85)+60 = 180
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Let's solve for x
(x+85)+60 = 180
x+85+60 = 180
x+145 = 180
x = 180-145
x = 35