Answer:
5 is the answer of the equation
There will be 235 rows fully filled but there will be half of one row that is extra
The surface area of a sphere is

where r is the radius;
The circumference is

so that

using this value we can evaluate the surface area of 1 ball as:

For 100 ball you get:
I don’t know what exactly you are trying to ask? But this equation would be an example of exponential growth.