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(31A) Logarithms in base a

Evaluate.

$2^4$

Evaluate.

$\log _{8}8=$

Evaluate. Give your answers as fractions.

$3^{-2}$

Evaluate.

$\log _{7}\frac{1}{49}=$

Evaluate. Give your answers as fractions.

$16^{\frac{1}{2}}$

Evaluate. Give your answers as fractions.

$\log_{243}\frac{1}{3}$