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  • math & puzzles Online Quiz - 106
  • The operation * applied to a number gives as its result 1...
Multiple choice general knowledge math & puzzles

The operation * applied to a number gives as its result 10 subtracted from twice the number. What is ((*9) ?

  1. -11

  2. 0

  3. 2

  4. -2

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The operation is f(x) = 2x - 10. f(9) = 8. f(8) = 6. f(6) = 2. Applying the operation three times starting with 9 results in 2.

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