How can negative 1 be greater then 0?
multiply both sides by "negative 1" (or any negative number excluding 0). This would make the side on -1 become a positive number. Any positive number would be greater than 0.
It depends. If you start with a positive number, then multiply by a positive greater than one and the answer is greater; multiply by 1 and the answer is the same; multiply by a number between 0 and 1 and the answer is smaller; multiply by 0 and the answer is 0; multiply by a number less than 0 and the answer is negative.