Answer:
a)
b)
c) For this case we have the total sales $ 15 millions after t =4 months
d)
e) This value represent the increase in the amount of sales in millions after t=4 months
Explanation:
For this case we have the following function for the sales
Part a
For this case we want to find the derivate of S respect to t and we got:
Part b
For this case we want to find the value of S when t = 4 so if we replace we got:
Part c
For this case we have the total sales $ 15 millions after t =4 months
Part d
For this case we just need to replace t=4 in the derivate and we got:
Part e
This value represent the increase in the amount of sales in millions after t=4 months