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A puppy gains weight, 
w, at a rate approximately inversely proportional to its age, 
t, in months.
Which equation describes this relationship?
Choose 1 answer:
(A) 
(dw)/(dt)=(k)/(w)
(B) 
(dw)/(dt)=(k)/(t)
(C) 
(dw)/(dt)=kt
(D) 
(dw)/(dt)=kw

A puppy gains weight, w w , at a rate approximately inversely proportional to its age, t t , in months.\newlineWhich equation describes this relationship?\newlineChoose 11 answer:\newline(A) dwdt=kw \frac{d w}{d t}=\frac{k}{w} \newline(B) dwdt=kt \frac{d w}{d t}=\frac{k}{t} \newline(C) dwdt=kt \frac{d w}{d t}=k t \newline(D) dwdt=kw \frac{d w}{d t}=k w

Full solution

Q. A puppy gains weight, w w , at a rate approximately inversely proportional to its age, t t , in months.\newlineWhich equation describes this relationship?\newlineChoose 11 answer:\newline(A) dwdt=kw \frac{d w}{d t}=\frac{k}{w} \newline(B) dwdt=kt \frac{d w}{d t}=\frac{k}{t} \newline(C) dwdt=kt \frac{d w}{d t}=k t \newline(D) dwdt=kw \frac{d w}{d t}=k w
  1. Understand Inverse Proportionality: Understand the concept of inverse proportionality. Inverse proportionality means that as one value increases, the other value decreases at a rate such that their product is constant. In this case, the rate of weight gain dwdt\frac{dw}{dt} is inversely proportional to the age of the puppy tt. This means that as the puppy gets older (tt increases), the rate of weight gain dwdt\frac{dw}{dt} decreases.
  2. Translate into Mathematical Equation: Translate the concept into a mathematical equation.\newlineSince the rate of weight gain is inversely proportional to the age, we can express this relationship as (dwdt)=kt(\frac{dw}{dt}) = \frac{k}{t}, where kk is a constant of proportionality.
  3. Match with Given Choices: Match the equation with the given choices.\newlineThe equation we derived, dwdt=kt\frac{dw}{dt} = \frac{k}{t}, matches choice (B) from the given options.

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