Respuesta :

1) Gathering the data

m∠CEF=2x +30

m∠DEC=x+102

m∠DEF=132

2) From the picture we infer that

m∠DEF = m∠CEF+m∠DEC

132 = m∠CEF +x +102

132-x-102=m∠CEF

m∠CEF=30