18 is the answer I believe hopefully this is correct
C , it’s become more adapted to and more modern
Answer:
x=2; the extraneous root x=42.
All the details are in the attached picture, the answer is marked with red colour.
It is c.
explanation:
20+130+h =180
when you solve you get h=50
130+g = 180
g= 50
50+60+f = 180
f=70