Final answer:
The main causes of the narrator's bad behavior were the deprivation of education and mistreatment he faced.
Step-by-step explanation:
The main causes of the narrator's bad behavior in paragraphs 9-10 can be attributed to the treatment he received from his mistress. Initially, she had been kind and started instructing him, but due to the advice and direction of her husband, she stopped his education and treated him as though he were a brute. This deprivation of education and the mistreatment he faced led to his rebellious and disruptive behavior.
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