alleryFunction f is INCREASING on interval (a, b) if:
Af = 0
Bf' = 0
Cf'(x) > 0 for all x in (a, b)
Df'' < 0
Answer & Solution
Correct answer: C. f'(x) > 0 for all x in (a, b)
If f'(x) > 0 on an interval, f is increasing there.
Similarly, f'(x) < 0 implies decreasing.
(Strict inequality gives strict monotonicity.)
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