Some Basic Logarithims Questions!

Ok guys, just brushing up on some review questions and a few have stumped me. Appreciate it if you can help me out WITH HOW you solved the question. Thanks! Now the questions...

1) $\displaystyle \frac {\log_{11} 64}{\log_{11} 16}$

******This one I thought was really easy but I got it wrong... So, If the base is the same (11), can't I just divide 64/16=4? Or, wait, can this be written as:

$\displaystyle {\log_{11} 64}$- $\displaystyle {\log_{11} 16}$

So $\displaystyle {\log_{11} 48}$ would be my answer?

2) Simplify

$\displaystyle

ln(a^2-b^2)-ln(a+b)

$

as much as possible.

** **** This again is a difference question so I can rewrite this as a quotient and solve? Right track?

3) If $\displaystyle

x=e^y.$ write $\displaystyle ye^y$ as a simple function of x.

****** I suck at word problems or interpreting you can say. Kind of lost on this one but I am thinking, re write this as an exponential function? Not sure, just throwing it out there!