1. I think the minimum fare for UberX is $5.
2. Uber adds $8.75 plus $5.25 for the tunnel toll. The tunnel only has a toll one-way, but Uber charges the toll for either direction when going to/from the airport. The $8.75 is arbitrary, as Logan doesn't charge drivers anything to drop off passengers.
3. UberX is always cheaper, especially as there is no tipping.
4. Hotel name is fine, and probably preferred by the driver.
5. I believe so.
The total fare should be about $20, give or take.