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In the figure below, line A is parallel to line B. What is the value of angle x?

A 140 degrees
Explaination
First, we find the supplementary angle to 40 degrees, which is 140 degrees. That tells us the angle opposite is 140 degrees. Because they are two parallel lines, then the mirrored angle must also be 140 degrees.
B 0 degrees
C 50 degrees
D 100 degrees