A bacteria population starts with 400 bacteria and grows at
A bacteria population starts with 400 bacteria and grows at a rate of r(t) = (450.268)e^1.12567t bacteria per hour. how many bacteria will there be after 3 hours ? 
Solution
given expression of growth translates into :
if the number of bacteria is represented by n
and the time ( in hours ) by t
then (dn/dt)=450.268 e ^ 1.12567t
=> dn = 450.268 e ^ 1.12567t dt
=>integral dn from 400 to N = integral (450.268 e ^ 1.12567t dt ) from 0 to 3
N-400=11313.233≈11313
=>N=400+11313=117313

