Solve the problem.Sales (in thousands) of a certain product are declining at a rate proportional to the amount of sales, with a decay constant of 21% per year. Write a differential equation to express the rate of sales decline.
A. dy/dt = -0.21y
B. dy/dt = -0.21t
C. dy/dt = e-0.21t
D. dy/dt = -0.79y
Answer: A
Mathematics
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