ACT 2010 December(69A) Math Question 14 Explanation - ACT Helper

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2010 December(69A) Math Question 14
Exponents, Radicals, & Scientific Notation
- Scientific Notation
Choice F
$3.9 \times 10^{- 1} = 0.39$ $3.9 \times 10^{- 2} = 0.039$ $3.9 \times 10^{- 3} = 0.0039$
There will always be one less zero in front of the three and the nine.
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