$120
60 + 10 = 70
70 - 20 = 50
50 ÷ 2 = 25
70 + 50 = 120
Answer:
The value of x is 
Step-by-step explanation:
see the attached figure to better understand the problem
step 1
Find the measure of arc DF
we know that
The inscribed angle measures half that of the arc comprising
so

we have

substitute

step 2
Find the measure of x
we know that
---> is a semi circle
we have

substitute

Hello,





I don't know what i have to do for the last one.
Hope this helps !
Photon