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By the same logic a twice-differentiable function is concave down when its derivative is:

AIncreasing
BZero always
CNegative always
DDecreasing
Answer & Solution
Correct answer: D. Decreasing
1. Concave down means the curve bends downward. 2. That happens when the slope keeps shrinking. 3. So it is concave down when the derivative is decreasing. _Source: OpenStax Calculus Volume 1, Chapter 4, Applications of Derivatives._
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