Question

Monica arrives at the dentist office at 12:56 and saw the dentist at 1:33 how long did she wait

Answer 1

Nitice that Monica arrived at 12:56 (four minutes before 1:00PM)

and was seen by the dentist at 1:33.

so we can add the 33 minutes after the hour (the 1PM), to the 4 minutes that she arrive ahead of the 1:00PM and get a total of : 33 + 4 = 37 minutes.