Recently took my car to Auto Zone for a free reading on my car. These were the results:

P0722- Output speed sensor - no signal condition
P0507- IAC circuit condition or idle speed higher/lower than expected
P0171- Fuel trim bank one condition

I know the majority of what each of these problems mean but, if someone could thoroughly explain them (in normal terms, haha) that would be GREAT.
I just need to know the extremity of these codes. The best and worst outcomes of repair. Overall, I am looking for the price range.

Any help would be much appreciated!