Respuesta :

a:
70 + 69 + n = 180
n = 41
X = 180 - 41 = 139 deg.

b:
Y = 50 (according to some theorem I forgot)
X = 180 - (50 + 60) = 70

d: :
180 - 160 = 180 - (20 + 70) = 180 - 90 
X = 90

e:
180 - 130 = 180 - (50 + 45) = 180 - 85
X = 95