Niether. They both have a 6/100 or 6% chance for one of their numbers to be picked. Just because they are close together in the somewhat arbitrary number ordering we use doesn't matter (assuming the choice of number is completely random).
Answer:
![\large\boxed{(D)\ z\geq-15}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7B%28D%29%5C%20z%5Cgeq-15%7D)
Step-by-step explanation:
![5z\geq-75\qquad\text{divide both sides by 5}\\\\\dfrac{5z}{5}\geq\dfrac{-75}{5}\\\\z\geq-15](https://tex.z-dn.net/?f=5z%5Cgeq-75%5Cqquad%5Ctext%7Bdivide%20both%20sides%20by%205%7D%5C%5C%5C%5C%5Cdfrac%7B5z%7D%7B5%7D%5Cgeq%5Cdfrac%7B-75%7D%7B5%7D%5C%5C%5C%5Cz%5Cgeq-15)
It is very simple you minus 9 from 7. 9-7=2. So Alberto's birthday is on the 2nd.