At a time denoted ast = 0a technological innovation is introduced into a community that has a fixed population of n people. Determine a differential equation for the number of people x(t) who have adopted the innovation at time t if it is assumed that the rate at which the innovations spread through the community is jointly proportional to the number of people who have adopted it and the number of people who have not adopted it. (Usek > 0for the constant of proportionality and x forx(t).Assume that initially one person adopts the innovation.)

Answer and Explanation:

He rate at which the innovation spread through the community is the number of people proportional to the people adopted it and the people who don't adopted it as constant of proportionality is k , and the fixed population of the community is n.

Suppose

 Number of people who have adopted innovation at time t = x (t)

Number of people who don’t adopted innovation at time t = n – x (t)

 Then the differential equation is:  

                                  dx/dt = kx (n-x), k > 0

Where k is the constant of proportionality.

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies