xxkukki
xxkukki xxkukki
  • 10-03-2020
  • Mathematics
contestada

I need help finding EF.

I need help finding EF class=

Respuesta :

miljanamilovanovic12
miljanamilovanovic12 miljanamilovanovic12
  • 10-03-2020

Answer:

EF=40

Step-by-step explanation:

DC=9, AB=x+11, EF=?

EF=x-20

EF=(AB+DC)/2

x-20=(x+11+9)/2

x-20=(x+20)/2

x-20=x/2+10

x-x/2=10+20

2x/2-x/2=30

x/2=30

x=30*2

x=60

EF=x-20=60-20=40

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