Tolong dijawab no 6 7 8 please!!!

6. f(x)=x+1(daerah asal 2,4,6,8)
tinggal masukin xnya aja
F(2)=2+1
=3
f(4)=4+1=6
f(6)=6+1=7
f(8)=8+1=9(jawabannya B)

8.a