Question 974057
log base 625 of exponent 5=??? 
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log base 625 of 5:  No reason to mention exponent.
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{{{625 = 5^4}}}
{{{5 = 625^0.25}}}
{{{log(625,5) = 1/4}}}
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Or, use the base change formula:
{{{log(625,5) = log(5)/log(625) = 1/4}}}