1. North America, Africa, Asia, Europe
2. South America, Antarctica, and Australia
3. North America, South America and Antarctica.
Answer:
the first option
Step-by-step explanation:
Given
Ax + By = C ( subtract By from both sides )
Ax = C - By ( divide both sides by A )
x = 
You can complete this by solving:

Which should give you .274418 or 27.44%
-7-w<10
Add 7 to each side
-w<17
Change signs and flip sign
w>17
Hope this helps :)