Eight questions about Harbor Bikes rentals, using everything from the unit. Read each one carefully: "more than" and "at least" are different, two conditions need & or | with parentheses, and a comparison with a missing value is never true, so unrated rentals drop out of any filter on rating.
One new trick appears here: you can compare two columns row by row, as in rentals["start_station"] == rentals["end_station"].