14
0 isn't a whole number.
Four
15
Four of them.
12
The whole numbers between 10 and 15 are 11, 12, 13, and 14. These numbers do not include 10 and 15 themselves, as they are not considered "between" in this context.
5
14 is immediately between the whole numbers of 13 and 15.
The sum of the first five whole numbers is 10.
Whole numbers consist of numbers from 0 to infinity. 15 is included in this set which makes it a whole number. Side Note: 15 is also a counting #, integer, rational #, and a real #
The numbers are 15 and 16.
7
-15 and -14 or 14 and 15 <><><><><> Or, if you consider whole numbers to be positive integers, then just 14 and 15.