Respuesta :

The answer is B
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This is a kite so m < X = m < Z
Total angles in a kite = 360 degrees.
So we have the equation

2(102) + 7x + 4 + 5x - 4 = 360
 204 + 12x = 360
12x = 360 - 204
12x = 156
x = 156/12 = 13 (answer)