Respuesta :

wegnerkolmp2741o

Answer:

x =14

DEC =  142

CEF = 38

Step-by-step explanation:

Since they from a line, their sum is 180 degrees

11x-12 + 2x+10 = 180

Combine like terms

13x -2 = 180

Add 2 to each side

13x-2+2= 180+2

13x = 182

Divide each side by 13

13x/13 =182/13

x =14

DEC = 11x-12 = 11(14) -12 =154 -12 = 142

CEF = 2x+10 = 2*14+10 = 28+10 = 38

jasdul1375

Answer:

x = 14, m∠DEC = 142, m∠CEF = 38

Step-by-step explanation:

m∠DEF = 180

m∠DEF =m∠DEC +m∠CEF

180 = 11x-12 + 2x +10

180 =13x -2

182=13x

14 =x

m∠DEC = 11x-12 = 11x14 - 12 = 142

m∠CEF = 2x+10 = 2x14+ 10 = 38

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