Answer:
B = 79°
Explanation:
The sum of interior angles of a quadrilateral is 360°.
(14x -11)° +(8x +7)° +(5x +18)° +(10x +13)° = 360°
37x +27 = 360 . . . . . . divide by °, collect terms
37x = 333 . . . . . . . . subtract 27
x = 9 . . . . . . . . . . . divide by 37
The measure of angle B is ...
B = (8x +7)° = ((8)(9) +7)°
B = 79°
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Additional comment
The other angles are ...
A = 115°, C = 63°, D = 103°