Gerri

In a rack of 15 billiard balls and one ball is selected at random what are the odds in favor it being a ball other than the 8 ball. I thought it would be 1/15 but I am not sure. Anyone help me on this?

What element is represented by this electron ground state configuration 4d^10 4f^14 5s^2 5p^6 5d^10 5f^14 6s^2 6p6 6d^2 7s^2 How do I figure this out

If a tree cast a shadow 30 feet long at the same time that a boy 5 feet tall cast a shadow 3 long. Find the height in feet of the tree.