Do you mean as in why is there no such thing as negative time? Then it is because time is always positive, signifying a continuos movement of time. A negative time representation would mean time is backtracking, or going backwards, which would be nonsensical for a representation of time.
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It will always be positive.
The answer is always positive. If the signs are the same (positive by positive, negative by negative), then the quotient is always positive. If the signs are different (positive by negative, negative by positive), then the quotient is always negative.
Yes. -1,0,1 you are always moving. always positive
Yes, a negative number subtracted from a positive number will always be positive. Subtracting a negative number is the same as adding the opposite of the negative number. The opposite of a negative number is always positive. A positive number plus a positive number is always positive.
No. A positive times a negative is always negative. A negative times a negative is always a positive.