Any number divided by itself is the same as ' 1 '.
31.880
31.880
One.
X divided by -Y is the same as -X divided by Y. Or - (X/Y)
It will be 3.
To divide fractions, you invert the second fraction and multiply. So, nine eighths divided by two thirds is the same as nine eighths multiplied by three halves (since two thirds inverted is three halves). This simplifies to 27/16, which is equal to 1 11/16 in mixed number form.
Technically, any number can be divided by any and all non-zero numbers, but I'll assume you mean evenly. There is no number that is evenly divisible by nine but not three because 9 is equal to 3x3. So when you divide by 9 it is the same as dividing by 3 twice.
24
30
1
The same number you started with.