I believe it is ni . Hope this helps
Density as you should know is equal to mass/volume. Solve for the volume.
Now, you know that you are dealing with a sphere. You know the volume of a sphere is V= 4/3pi r ^3.
You know the volume so just solve for r
Sr, because they are just basically asking for it so it is just Sr
I believe the answer is 11, its been awhile since i was in science
