Answer:
A. 90 + 13 + x = 180
Explanation:
PMW is a straight line and it is made up of the 3 angles, TMW (13), RMT (90), and PMR (x), thus 90 + 13 + x = 180. To find x, you can just take 180 and minus the remaining angles (90 + 13) off it.
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