exam Maths Puzzle Numerical Ability

i am not sure if you can help me with this problem but i will try to explain it..it was given to us in class. thanks for any help..

the question is
evaluate using logs

^3 sq

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exam Other Question

f(x)=1/x-4x-5 find the domain of f(x) a two digit number is 5 times the sum of its digit. when 9 is added to the number the result is the original number with its reversed. find the original number