World's population that lives in China in percentage is 20%
Answer:

Step-by-step explanation:
The area of a square with side length
is given by
.
Therefore,
.
Answer:
y = 6x - 9
Step-by-step explanation:
The function is; y = 6x - 9
Here, variable x is independent.
I'm pretty sure it's 5 because 15-10=5.