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Express the equation in exponential form
(a) `\log_2 8 = 3`.
That is, write your answer in the form `2^A=B`. Then
`A=`  
and
`B=`  

(b) `\log_5 125 = 3`.
That is, write your answer in the form `5^C=D`. Then
`C=`  
and
`D=`