math

ABCD is a quadrilateral inscribed in a circle, as shown below:

What equation can be used to solve for angle A?
(x + 16) + (6x − 4) = 180
(x + 16) + (x) = 90
(x + 16) − (2x + 16) = 180
(x + 16) − (x) = 90

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  1. hard to say, but opposite angles are supplementary, right?

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