I never caught on to logarithms, so anything would help. I need help solving these two problems, but if anyone can direct me somewhere that really explains logarithms it would be a great help!

Find the value of log 50 - log 5, where log is the base 10 logarithm.

Evaluate log(v3)27.
I didnt really know how to type that out. It should be log (down 3) 27. Would the down 3 be the base? I just don't understand what to do with it.