Question 169385
 How do you solve: 
log base a 5 = 0.699; log base a 3 = 0.477; find log base a 15 
rewritten: log (a,5)=0.699; log (a, 3) = 0.477; find log (a,15).
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The log of a product is the sum of the logs of its elements.
log(15) = log(3) + log(5), IF they all have the same base.
So, the log(15) is 0.699 + 0.477
log(15) = 1.176