I think I understand what the problem is asking.
There is an operation between the numbers 48 and -8 that can give as answer -6.
Notice that the actual division: 48 divided by the number (-8) gives for answer -6.
This is because 48 = (-6) * (-8)
The multiplication of negatives renders a positive answer.
So please, if the computer allows you to select an operation in between 48 and -8, select DIVISION
48 / (-8) = -6
In the case of -40 operation (8) = -5
notice again that -40 DIVIDED by (-8) renders -5 because (-5) * (-8) = 40
So please again select the DIVISION symbol
-40 / 8 = -5
In the case of: 12 operation (-2) = 14, please select SUBTRACTION
since 12 - (-2) = 12 + 2 = 14.
In the case of:
18 operation (-12) = 6 Please select ADDITION, since:
18 + (-12) = 18 - 12 = 6
Just use the 4 possible operations between numbers (for example with the help of a calculator), to find which operation gives you the answer you want and are looking for.
Just type the first number, then select a symbol between +, - , *, division, and see which one gives the answer you want.