Editor
The integral of $10^{-x)$ is:
Difficulty: Easy
A: 
$\frac{10^{-x+1}{-x+1}$
B: 
$-x10^{-x+1}$
C: 
$\frac{1}{\log{20}}\log{10}^{-x}$
D: 
$-\frac{1}{\log{20}}\log{10}^{-x}$
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