No, -8.5 is not an integer. An integer is a number without any fractions.
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Integers are x, x + 2 and x + 4. 2x + 4 = 5x + 10 - 51 3x = 45 so x = 15 and the other integers are 17 and 19. Check: 15 + 19 = 34, 5 x 17 = 85, 85 - 51 = 34. There you have it.
an integer plus and integer will always be an integer. We say integers are closed under addition.
If the integer subtracted is smaller than or equal to the first integer, then the answer is positive. Otherwise, if the integer subtracted is larger, then the answer is negative.
It is not an integer, nor can it ever be an integer. It can, however, be rounded to the nearest integer, in which case 0.1 will round to 0 to the nearest integer.