Answer: C.) y=9x+12
Explanation:
From the given table we can see in 0 days the rent of lawn mower =$12
Let's check all the given options
A) y=x+21
At x=0, y=21
It is not the required equation.
B) y=9x+21
At x=0, y=21
It is not the required equation.
C) y=9x+12
At x=0,

At x=1,

Atx=2,

It is the required equation which shows the best relationship between x and y.