Answer:
1%
Step-by-step explanation:
I assume since it’s .9% it’s less then 1%
The volume of a sphere of radius r is given by

For your given conditions, the volume of 1/2 a sphere becomes

Seems to match your 2nd choice:
... 1 over 24 over 322 over 7(83)
Answer:
2.3
Step-by-step explanation:
1. Common ratio is 5
2. 47
3. I believe the answer is -18, though you might want a second opinion on it to make sure it's correct.
Hope this helped! Good luck! :)