The logarithm to the base 10 of 100 is 2, because 102 = 100.
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logarithm of 100 = 2. If there is not a subscript number on your log, you assume it to be 10. In other words, the little subscript would be the base if you were raising it to a power, and the big number is the answer of the power. For example, log (base 10) 100 = 2 because 10 (the base) raised to a power of 2 (the log answer) = 100 (the number you just took the log of.)
natural log
log x + 2 = log 9 log x - log 9 = -2 log (x/9) = -2 x/9 = 10^(-2) x/9 = 1/10^2 x/9 = 1/100 x= 9/100 x=.09
You can rewrite the equation as... 100=10x X=2
Yes. Logarithms to the base 10 are called common logarithms, and 2 is the correct common logarithm for 100.