Two-thirds and one half is one and one sixth.
First, you times to denominators,
Then, you times the top by the bottom across, NOT BOTTOM!
Lastly, you add the top together then simplify, to get one and one sixth as your answer!
The formula for volume of a sphere is

To get radius from diameter, we must divide it by 2. 10/2=5, meaning the radius is 5 in.
Now, we just need to plug the values into the equation.