Drug epidemic in an epidemiological model used to study the spread of drug use, a single drug user is introduced into a population of n non-users. under certain assumptions, the number of people expected to use drugs as a result of direct influence from each drug user is given by
s=∫^[infinity]_0 a(1-e^-kt)/k e^-kt dt.
where a, b and k are constants. find the value of s.

Frank has $66.50 in his account on sunday. over the next week, he makes the following changes to his balance via deposits and purchases: day debit ($) credit ($) monday 60.33 80.75 tuesday 54.45 wednesday 49.20 15.00 thursday 35.40 friday 16.85 75.00 saturday 80.56 on what day does frank first get charged an overdraft fee? a. wednesday b. thursday c. friday d. saturday select the best answer from the choices provided a b c d

What is the result of adding the system of equations? 2x+y=4 3x-y=6

What is the inverse of the function f(x) = 2x + 1?