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Fuel trim is a measure of how much the amount of fuel is being messed with, compared to the basic amount that is supposed to get injected. You have two of them most likely because you have two banks of cylinders. The one is stuck at 80 almost certainly because the O2 sensor on that bank is dead. Fix it, and the trim reading should start behaving much better.
Note that there are short-term trims and long-term trims as well. The long-term one doesn't tend to change much, while the short-term one changes much more. I would suggest that your second trim is the long-term one, but a value of 80 doesn't sound like a LFT value.
-soD
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