Question 866646
Try completely factoring the 16875 into its prime factorization.
{{{16875=9*1875=9*25*75=highlight_green(3^2*5^2*2*5^2)}}}.


{{{log((16875/2))=log((16875))-log((2))}}}
{{{log((2*3^2*5^4))-log((2))}}}
You should be able to continue from here and finish.