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Guessing riddles (playing mathematical nouns): passengers should know; Bullfighting; Shave; Authentic; Fiscal deficit.
The following is the original question

1. Information for passengers

-Multiplication

2. Destroy everything that can be divided

3. Count backwards from the last number

4. 10 cents left

-complementary angle

5. Bullfighting

-Right angle

shave (the face)

-Airplane

walk side by side

-Parallel

8. Real goods

-Absolute value

9. Fiscal deficit-negative