10-7 = 0.0000001
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.0000010
- 3 - 7 same as, - 3 + (- 7 ) = - 10 -------------
1.0 × 10-7 written in regular notation is 0.00000010
Not necessarily. Examples: -1 - (-5) = -1 + 5 = 4, which is positive, but -10 - (-3) = -10 + 3 = -7, a negative. So it depends on the numbers used.
7.75763 × 10-7 written in standard notation is: 0.000000775763