Question: Help with Plot()

Newbie question, please help.  I'm getting a little frustrated with Maple 13; read on-line help but don't seem to find the pattern for my problem.

Symptoms:

Type: exp(-t) + t

Highlight on the expression, right click on Plot. I got a plot.

Type: plot ([exp(-t)+ t, t=-2..2]);

Maple 13 gives me back the expression, but no plot. 

Please help.  Thanks in adance.

 

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