Logarithms: Expanding, Condensing, and Natural Logs

[Chiquita]

Okay guys- I have two log questions. I read the pages on logarithms, but they didn't seem to have what I was looking for.
First question- Use the properties of logarithms to condense.
4lnx - 5lny

Second question- Use the properties of logarithms to expand.
log₂3a⁴

So I know that the first question involves natural logs... but that's about it. I don't know how to condense/ expand logarithms- well I probably know how to, I just don't know it under that terminology.
And I can't remember what the properties of logs are.
Please help!

[QM deFuturo]

Well you can review the properties of logs here:

http://www.purplemath.com/modules/logrules.htm

If you look at these, and look at your equations, you will probably be able to figure out how to re-write them to solve the problem.

QM