Write whether the following is a Constant or a Variable.
1. 3e + Of
2. x + 3
3.5g + 18
4. a + 6b
5. 3+6
6. The number of months ending with "ber" in a year
7. The water consumption in each month
8. The number of hours in a day
9. The number of patients in the hospital each day
10. The number of pupils in a particular school each year ​