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Representing simple functions

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Input, rule, output

Forwards with the rule · backwards with the inverse× 21236510inputoutputto find an INPUT, use the inverse: ÷ 2inverse of add is subtract · inverse of multiply is divide
Output 10? Then the input was 10 ÷ 2 = 5.
  1. 1A function machine takes an INPUT, applies a rule, and gives an OUTPUT.