College Calc I

If f is decreasing and f(20)=10, which of the following must be incorrect? Explain.

a. (f^1)'(20)=-3
b. (f^1)'(10)=12

how would i go about figuring this out??? i'm not sure exactly what the concept in question is here.

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asked by Eva
  1. Well if it is decreasing it does not have a positive slope.

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    posted by Damon

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