The first one because it’s the actual formula for a sphere and it has pie at the end because we are solving for a sphere
Answer:
Center: 
Radius: 
Step-by-step explanation:
It is necessary to remember that the Equation of the circle in Center-radius form, is:

Where the center of the circle is at the point (h, k) and the radius is "r".
Then, given the following equation of the circle:

We can notice that it is written in Center-radius form. Then we can identify that:

Therefore the center is:

And the radius is:

The answer is 7:17 because when you add them together it equals 7:17.
Its may be A or C
i am not sure just try to help
Answer:
m + 2
2 dollars + one dollar per minute