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8.0 × 10-9 written in regular notation is: 0.0000000080
The result can be either positive or negative, depending on the sizes of those original two negative numbers. (-8) minus (-10) = positive 2 (-8) minus (-5) = negative 3
-10 minus -10 is 0.
1 plus negative 10 is equal to -9.
-1+8, -2+9, -3+10 and so on.