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**1. The problem statement, all variables and given/known data**

A company introduces a new product for which the number of units sold S is

S(t)=200(5-(9/(2+t)) where t is the time in months

a) Find the average value of S(t) during the first year

b)During what month does S'(t) equal the average value during the first year

**2. Relevant equations**

f'(c)=(f(b)-f(a))/(b-a)

**3. The attempt at a solution**

well, i have no idea how to do it, but i believe for a), you have to find the derivative of the function(which i have no clue what it is) then use the equation given above to find the average value

For part b), i just have no clue