All whole numbers can be natural numbers (but not the other way around)
All natural numbers and all whole numbers can be integers (also not the other way around)
All natural numbers, whole number and integers can be rational (not the other way around :):):)):))
Natural numbers: 1, 2, 3, 4...
Whole numbers: 0, 1, 2, 3...
Integers: -2, -1, 0, 1, 2...
Rational number: -2.5, -1.72, 0, 1, 3.77... (any number that can be written down)
It is not a whole number because it is negative.
It is not a natural number because it is not a whole number.
It is not irrational because it can be written as a fraction.
-12 and -5 are both integers. We can tell that they're not natural numbers or whole numbers because they're both negative, and they're not rational or irrational because they have no unsimplified decimal or fraction.
-12/-5 = 12/5 = 2.4
These numbers are not closed because they produced a number outside of their set (integers). 2.4 is not an integer. By dividing two integers you got a noninteger result, which indicates that it's not closed.
answer///radio frequency interference (rfi);