Question: A certain industrial machine depreciates so that its value after t years becomes Q(t) = 20,000e 0.4t dollars. a. At what rate is the value

A certain industrial machine depreciates so that its value after t years becomes Q(t) = 20,000e^−0.4t dollars.

a. At what rate is the value of the machine changing with respect to time after 5 years?

b. At what percentage rate is the value of the machine changing with respect to time after t years? Does this percentage rate depend on t or is it constant?

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