What integer comes after 8, perhaps.
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Every number except zero is a factor of every other number. Usually this kind of question is intended as a question about integral factors, those that can be paired with another integer to produce the number as a product. In that sense, 9 is not an integral factor of 11, because the paired number with 9 is 11/9, a number that is not an integer.
The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
+9
Well, isn't that a happy little question! The value of the 9 in 3.91 is 9 tenths, which means it's part of a whole. Just like adding a touch of color to a painting, each digit in a number has its own special place and value.
No. 9/9 = 1, a whole number.