Mike J answered An integer is a whole number, therefore it can not be a fractional or decimal number. There are nine integers between 17 and 27 (18, 19, 20, 21, 22, 23, 24, 25, and 26).
Yo Kass answered As Mike said above, there are only nine integers between 17 and 27.It's simply a matter of counting the whole numbers on the numberline to work this problem out.And as Mike said, you don't need to worry about fractions or decimals, as these don't fall under the category of "integers"In fact, the dictionary definition of integer is:in·te·gerˈintijər/noun1. A whole number; a number that is not a fraction.2. A thing complete in itselfHope this helps, but feel free to ask a new question if you need a bit more help getting to grips with algebra and mathematics in general!