Negative numbers are useful whenever there are two opposites. For example, going up might be described by a positive number, going down by a negative; gaining money might be described by a positive number, losing money by a negative number. Such numbers will typically NOT be integers; you can use integers whenever the unit used (and the precision required) does not require you to use decimals. For example, "altitude below sea level" will be a negative number; if you don't need numbers less than a meter, you can use whole meters.
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The answer would be -1 (minus one)
An integer is any whole number, so the answer would be true.
This would be impossible - since the mean of the three integers would have to be an integer, and if you divide -56 by 3, you do not get an integer.
If sea level is 0, then feet above sea level would be a positive integer, while feet below sea level would be a negative integer. The integer for six feet below sea level would be -6.
It would be an integer (positive or negative whole number).