TheWrathfullKing
TheWrathfullKing
14-06-2018
Mathematics
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gmany
gmany
14-06-2018
Use:
[tex]a^{-n}=\dfrac{1}{a^n}[/tex]
[tex]20\cdot5^{-2}=20\cdot\dfrac{1}{5^2}=\dfrac{20}{25}=\dfrac{20:5}{25:5}=\dfrac{4}{5}[/tex]
Answer: B. 4/5
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