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The sales of a new​ high-tech item​ (in thousands) are given by ​S(t)=101-80e-0.2t where t represents...

The sales of a new​ high-tech item​ (in thousands) are given by

​S(t)=101-80e-0.2t

where t represents time in years. Find the rate of change of sales at each time.

​a.) After 1 year.​ b.) After 5 years.​ c.) What is happening to the rate of change of sales as time goes​ on? d.) Does the rate of change of sales ever equal to​ zero?

Math   Calculus   
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