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The exponential and log function help watch

1. Im doing this book on my own and i need a bit of help on this question.

Solve the following equations, giving exact solutions:

ln2 + lnx = 4

Ive got more questions, but lets get through this one first.

Thanks
2. ln a + ln b = ln (ab) a basic rule of log from P2.

so

ln2 + lnx = 4
ln 2x = 4
2x = e^(4)
x = (1/2)e^(4)
3. Is Ln using the same laws as logs???

I never knew that....
4. ln is the same as log to base e
5. Ok, thanks for that.....i think i got it now....

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