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Parenthesis Exponents Multiply Divide Addition Subration Or, PEMDAS
Add your whole numbers
Yes because being closed under an operation means that when the operation is performed on members of a set the result is also a member of the set, and when any two [members of the set of] whole numbers are added together the result of the addition is also a whole number which is, unsurprisingly, a member of the set of whole numbers.
A set can be closed or not closed, not an individual element, such as zero. Furthermore, closure depends on the operation under consideration.
Same rules as adding whole numbers with different signs.