The average daily metabolic rate for captive animals from weasels to elk can be expressed as a function of mass by r = 140.2m0.75 , where m is the mass of the animal (in kilograms) and r is the metabolic rate (in kcal per day). Source: Wildlife Feeding and Nutrition. a. Suppose that the mass of a weasel is changing with respect to time at a rate dm/dt. Find dr/dt. b. Determine dr/dt for a 250-kg elk that is gaining mass at a rate of 2 kg per day.

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