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A function $f$ is strictly decreasing on an interval if, throughout it:
A$f'(x) < 0$
B$f'(x) = 0$
C$f'(x) > 0$
D$f(x) < 0$
Answer & Solution
Correct answer: A. $f'(x) < 0$
A function is strictly decreasing where its derivative is negative.
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