What effect does landing at high elevation airports have on groundspeed with comparable conditions relative to temperature, wind, and airplane weight?

1) Between which latitudes are you most likely to find the subtropical high-pressure belt?

2) Which is true with respect to a high- or low-pressure system?

3) While flying cross-country, in the Northern Hemisphere, you experience a continuous left crosswind which is associated with a major wind system. This indicates that you

4) Why does the wind have a tendency to flow parallel to the isobars above the friction level?

5) What effect does landing at high elevation airports have on groundspeed with comparable conditions relative to temperature, wind, and airplane weight?