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The form that uses only powers of ten are logarithms to base 10. The scientific notation does use powers of ten but the original number is also used in this representation.
No it is not. It is the metric system invented by the French which based on powers of ten. And it is the Empirical system, not the English system.
Multiplying a real number by a positive power of ten moves the decimal point that number (the exponent) of places to the right. Multiplying by a negative power of ten moves it to the left. For example, the -3 power of 10 is 1/1000; multiplying by that moves the decimal point 3 places to the left.
SI uses powers of 10.
25 When you are multiplying anything by ten, move the decimal to the right one spot, and you have your answer.