THE GAMER NEXT DOOR

Answer: The answer is: "Power." Miss Trunchbull is a sadistic bully, as a school headteacher she can terrorise, frighten and dominate children and teachers. Also the job pays a good salary. She has probably arranged things so the other teachers do all the real work and the difficult jobs. She lives in a house attached to the school, so she gets free accommodation. She can run scams: for example the pupils must be fed, so she gives the catering contract to a company who pay her a "backhander." Thus she has a lucrative job where she does very little work. Plus, you cannot have a story without a villain to be defeated, so Miss Trunchbull is a brilliant opponent for Matilda.

Rob Halliday

Answer: It's a common enough trope to the point where it has become cliche. Stories set in a school will almost always have a teacher or principal (or both) openly dislike their students. Stories aimed at a younger audience will often exaggerate this to an extreme, where the teacher/administrator has a hatred of children in general that borders on insanity.

BaconIsMyBFF

Answer: He doesn't bring her in the book, but in order for the plot to work out, they had to plant her there some way.

Answer: He probably wanted help, she was seen putting the bumper on the car with Mikey. He probably had other tasks for her to do, but she annoyed him by calling him a crook before he could give her more jobs and then Zinnia arrived shortly afterwards.

Answer: Just to bring her, as her guardian.

Answer: They are FBI, and they are undercover.

Answer: It's a joke, because they are too stupid to know that Guam is a territory of the United States.

Answer: She knows. Listen to her and Harry after their TV explodes: "I told you that was a cheap set." "It's not a cheap set, it's a stolen set!" She knows that Harry is a criminal.

THGhost

Answer: Another way to tell is when Harry takes Mickie and her to his shop. She sees him using sawdust in the transmission and tells him he is doing something illegal.

Answer: Also, when Zenia is talking to the cops aka speedboat salesmen, she's talking about Harry having money in banks all over the place.

Answer: He has been receiving and selling stolen car parts.

Answer: It is a federal violation to own/operate a "chop shop." Other possibilities include interstate transport of stolen vehicles or car parts, altering Vehicle Identification Numbers (VINs), and falsifying documents. After a VIN is altered, it is difficult to positively identify the vehicle as stolen and acquire the necessary evidence to get a conviction if the.case goes to trial. But it is the interstate aspect that makes the FBI the key investigators.

KeyZOid

Answer: He had stolen car parts.

Chosen answer: The glue would keep the car part on but only for a short time because only glue was used. Harry didn't use tools to put on any bolts or anything to keep it in place so eventually it would fall off from the glue drying up.