The ratio A/r² would represent

which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle is

r² and if you divided that by the radius squared, you are given pi which is the circumference of a circle divided by its diameter.
I honestly don't know if this is correct but it might be i think its the middle one y=f(x)=x to the second power
Answer:
10
Step-by-step explanation:
Answer:
D. 
Step-by-step explanation:
Given

Required
Determine its equivalent
<em>From the list of given options, the correct answer is</em>

This is shown as follows;

Multiply both sides by 

Open Bracket


Subtract x from both sides


Multiply both sides by -1


Reorder

<em>Hence, the correct option is D</em>

A) (4,6) would also be on this line. Let me know if you have any other questions!