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It is -6 or -6*10^0 if you wish to emphasise the scientific notation!
0.9x10-1 is 0.09. In scientific notation, 9x10-2
In the SI (metric) system mass is about 3 milligrams or 0.003 grams or 3 times 10 to the negative 3 power in scientific notation. In the US system mass (weight) is 0.0000066 pounds or 6.6 times 10 to the negative 6 power in scientific notation.
6.71 × 10-5 is the scientific notation (form). Written in standard notation it is: 0.0000671
The scientific notation is negative if the number itself is negative and not otherwise. Thus the scientific notation for -2500 is -2.5*103. Perhaps what you were thinking was when the exponent, or power of 10, is negative. This is negative when the magnitude of the "ordinary" number is smaller than 1. Thus 0.25 = 2.5*10-1 So, if the number itself is less than 0 and its magnitude is less than 1 (ie -1 < x < 0), then both are negative. For example, -0.0025 = -2.5*10-3