Logarithms used to be extremely important. With modern calculators, logarithms aren't quite as critical as they used to be, but they're still very useful in some cases. There are a few definitions and identities that will help us out a bit, the most basic ones are:
log (10x) = 10log x = x
ln (ex) = eln x = x
The following work for either common logs (log, base 10) or natural logs (ln, base "e"):
log (AB) = log A + log B
log (A/B) = log A - log B
log (AB) = B log A
A little practice will help lock these in. Good luck.
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