10 log10 (10x92/10-10x88/10)
Thanks anon, you are right. You have answered the question that was asked correctly :)
However I suspect that the asker had a differen question in mind.
Anon, If this is not the question that you wanted answered then please try to clarify your question.
log10 is equal to 1 (because 10 to the power of 1 equals 10)
so 10*log10 is equal to 10*1=10
the result in the brackets is 4 (you can do this using calculator)
So, the final result is 40 (10*log10*(10*92/10-10*88/10) = 10*4 = 40)