Answer:
Integers.
Explanation:
I'm assuming you are talking about number groups, such as integers, natural numbers, whole numbers, etc.
If so, then -15 belongs to the 'integers' group.
This is because consists of numbers that are not fractional components, such as -5, 5, 4, -4, -15, 15, 8, 91, 200, -200, etc. Basically, integers include only negative and positive numbers.
Natural numbers include positive integers only, such as 5, 15, 87, 100, 20, etc.
Whole numbers do not include negative numbers, fractions, or decimals. Examples of whole numbers include: 8, 16, 20, etc.
Therefore, -15 belongs to integers.