This link should help
http://www.mathwords.com/m/multiplicative_inverse_of_a_number.htm
Good Luck :)
Answer:
Derived from Latin ne scio, meaning do not know, nice meant silly or ignorant when borrowed into English. Through the phrase a nice distinction, it came to mean precise.
C. The narrator feels disillusioned
Answer: I believe it means to create/cause change within someone.
Explanation: Just what I remember.