I believe if i am understanding the question right the radius=4
Given

To obtain the minimum value of y, we first take the derivative of y
The derivative of y is:

Equating

gives the minimum value we require.
Doing that, we have:

So that

Therefore, the minimum value is x = 3
Answer:
is the difference between highest and lowest values.
Step-by-step explanation:
By searching up what is the square root of the number you have