alleryA tank is draining and a student is asked how fast the depth falls when the volume is changing at a known rate. That is again a problem of:
ARepeated trials
BReduced fractions
CRational roots
DRelated rates
Answer & Solution
Correct answer: D. Related rates
1. Depth and volume are linked by the tank's geometry.
2. Differentiating that link with respect to time connects the two rates.
3. It is a related rates problem.
_Source: OpenStax Calculus Volume 1, Chapter 4, Applications of Derivatives._
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