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One of these four statements about the mean value theorem fails. Which is it?

  • A.it requires continuity on the closed interval
  • B.it requires differentiability on the open interval
  • C.it guarantees at least one such point exists
  • D.it locates the point c explicitly

Answer: D

The theorem is an existence result: it promises some \( c \) with \( f'(c) \) equal to the average slope, without saying where. Finding \( c \) means solving an equation, which for most functions cannot be done in closed form. The two hypotheses and the existence conclusion are all stated correctly

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