You need to add x1 and x2 then divide by two, then add y1 and y2
I'll just give you some clues ^^
- Nature , people around you , food, clothes , what did you do ( housework, helping your parents on something , ... ) , ...
If you go to school : what subjects did you learned, how's the teacher
I think , ... that's it !! :)))
Answer:
Acid rain is slowly destroying once-resistant granite. Acid rain is created by air pollutants. ... The chemicals fall to earth as acid rain. Of all the building stones, granite is the least susceptible to acid rain because its composition is of feldspar and quartz, both of which resist attacks of acid.
I believe the answer is B
