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Increasing and Decreasing of Functions Review

If Pierre is going downhill, then the graph is decreasing:
 

on the invertal ( -3 , 1 ) Pierre is sliding downhill (Wheee!) ... therefore the graph is decreasing
 

So, our graph is decreasing on

( -3 , 1 )
 

Notice that I'm not using the endpoints on these:

Like [ -3 , 1 ] ... closed interval
 

Think about it...  When Pierre is standing right ON x = -3...

Pierre is standing on x = -3 ... the graph is not increasing or decreasing
 

he's not going uphill or downhill.  He's just standing there!