Chapter 4, Lab 1 defines latitude as
Latitude decreases in value as you move west
Latitude specifies the North-South position of a point on Earth. Longitude specifies the East-West position of a point on Earth. This is made even more confusing by the coordinate tuple not following the generally accepted convention of (latitude, longitude). The question should be rewritten as:
Longitude decreases in value as you move west.
How many trips in the sample_training.trips collection started at stations that are to the west of the -74 longitude coordinate?