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(31A) Logarithms in base a

Evaluate.

$5^4$

Evaluate.

$\log _{8}64=$

Evaluate. Give your answers as fractions.

$4^{-1}$

Evaluate.

$\log _{6}\frac{1}{36}=$

Evaluate. Give your answers as fractions.

$81^{-\frac{1}{4}}$

Evaluate. Give your answers as fractions.

$\log_{625}5$