Answer:
EcD= 52 DCB=128
Step-by-step explanation:
First, let's find out what x equals and what (x+11) equals
[tex](x+11)+(3x+5)=180\\4x+16=180\\4x=164\\x=41[/tex]
And therefore...
[tex]x+11=52[/tex]
Now angle ecd is a vertical angle we just found.
So angle ECD= 52 degrees
And agles ECD and DCD and supplimntary
[tex]52+?=180\\DCB=128[/tex]
