Characterization

Which type of characterization is the following sentence: Alex put on his scrubs before heading to the clinic.

Which type of characterization is the following sentence: Bailey tried to be helpful around the house.

Which character type best describes the following person: A side character, known for their mathematical abilities, who helps the main character complete a math competition.

How would you describe a character who doesn't change in a story but feels like a real person?

How would you describe a character who changes many times in a story but only has one notable trait?

How would you describe a character that, over the course of a book series, goes from a round character to one that has a single, exaggerated trait?