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(31A) Logarithms in base a

Evaluate.

$2^4$

Evaluate.

$\log _{5}25=$

Evaluate. Give your answers as fractions.

$3^{-5}$

Evaluate.

$\log _{3}\frac{1}{27}=$

Evaluate. Give your answers as fractions.

$256^{\frac{1}{4}}$

Evaluate. Give your answers as fractions.

$\log_{25}\frac{1}{5}$