Ask questions. It doesn't matter how simple they are. You might or might not be right about your ideas but your group will always benefit from thinking things thoroughly.

dragon: length is always positive 
dragon: it can't be -3 or something like that 
gdog: why not?
dragon: well   
dragon: think about it 
dragon: can you have something -3 feet tall? 
gdog: lol
gdog: oops
mwiz34: but absolute value changes it into all positive
dragon: yea    
dragon: because 
dragon: like   
mwiz34: so it doesn't really matter, does it?