Negative numbers were accepted in the 1700's
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It seems that negative numbers have been used around the time of Christ, but it took centuries more before they were generally accepted. See here for some history: http://en.wikipedia.org/wiki/Negative_numbers#History
The product of three negative numbers is negative.
They will be negative numbers as for example -5+(-7) = -12
No, it is measured in positive numbers but it can be represented by negative numbers.
12