Question 22515
For #1, we can condense this using log properties to log((6*3)/X)=log9.
We can then take 10^(each side), giving the algebraic equation 18/X=9, so 9X=18, so X=2.

#2 means 10^X=125.
#3 means 10^X=t.
#4 means 10^X=1, so X=log1=0.

I'm not completely sure what the question is asking of you in 2,3, or 4.