The sales of a new high-tech item (in thousands) are given by where t represents time in years. Find the rate of change of sales at each time.) After...

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

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​ zero?