technically speaking yes the opposite of 5 is -5
If you mean 21517 then it is an integer because it is a whole number. If you mean 2.1517 then it is not an integer because it is not a whole number.
An integer is a whole number. Adding a integer would just mean to add a whole number.
What exactly do you mean when you say "the opposite of a whole number" . . .
An integer is a whole number without fractions or decimals
If you mean 5110 then it is an integer because it is a whole number
It is a number of inches where that number is an integer.
The answer must be a whole number.
An integer is a whole number. Nonnegative mean not negative. A nonnegative integer is a whole number that is not a negative number. For example, 0, 1, 2, 3, 4, 5,....
If you mean -20 then it is an integer because it is a whole number
Whole number means the same thing as integer and does not have a fraction or decimal part. Rational numbers can be expressed as a ratio of whole numbers.
Yes. All whole number, integer and natural number and even fractions and decimals are rational numbers
If by "opposite" you mean its additive inverse, the answer is 0. If by "opposite" you mean its multiplicative inverse, for the number x, it will be (x+1/x).