In someone affected with measles, the virus level $ N $ (measured in number of infected cells per mL of blood plasma) reaches a peak density at about $ t = 12 $ days (when a rash appears) and then decreases fairly rapidly as a result of immune response. The area under the graph of $ N(t) $ from
$ t = 0 $ to $ t = 12 $ (as shown in the figure) is equal to the total amount of infection needed to develop symptoms (measured in density of infected cells x time). The function $ N $ has been modeled by the function $$ f(t) = -t(t - 21)(t + 1) $$
Use this model with six subintervals and their midpoints to estimate the total amount of infection needed to develop symptoms of measles.
The table shows the number of people per day who died from SARS in Singapore at two-week intervals beginning on March 1, 2003.
(a) By using an argument similar to that in Example 4, estimate the number of people who died of SARS in Singapore between March 1 and May 24, 2003, using both left endpoints and right endpoints.
(b) How would you interpret the number of SARS deaths as an area under a curve?
okay. We know the area of Los de Graff and above the axis of time or tea is equivalent to the distance traveled. In this context, acts would be equivalent to 61 sirrah if I'd buy sex, which is one. Therefore, we now have one times 55 plus 40 plus 28 hours adding up all the individual areas. This is 155 feet.