A couple simple questions, dudes

[Andrew Puls Q-Bot Eye]

Hey Dudes,
   Can you put a 50k resistor and a 100k resistor in series to create
150k of resistance (can I combine a  100k and a 50k to replace a 150k
resistor)? Also, if I can combine them, should they be in series or
parallel? I thought it would be in series, but I'm not sure.  
   My second question is, how do you convert a circuit that is
supposed to drive a small speaker so that it can be used to drive a
line out in addition/instead? The project I'm trying to convert to
line out is the photocell controlled Micro Theremin (TherMan) at:
http://www.tomg.vivid.net/theremin/theremin.html
Who knows, maybe I don't have to do any thing.  I guess I'll find out,
huh?
  Thank you for your help, dudes.
==
Q-Bot, Andy Puls
q_bot at yahoo.com

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