Question

A. Are the integers closed under addition and subtraction? In other words, when you add or subtract two integers, is the result always an integer? Justify your response.

b. Give a counterexample to show that the whole numbers are not closed under subtraction.

Answer 1

a. The result is always an integer because integers are not fractions or decimals.

b. Sorry I don't have an answer for b i don;t know what that means. :(