we are given following problem: Students are given an exam and retake the exam later. The average score on the exam is
S = 80 - 14ln(t + 1)
where t is the number of months after the exam that the student retook the exam. At what rate is the average student forgetting the information after 6 months?
i think that we should take derivative of S with respect t and put 6 into derivative .in this case
dS/dt=-14/(t+1) if we put t=6 we get -(14/7)=-2 so it means that about 2 student forget information after 6 month?am i right ?maybe i am confused of some condition of this problem if so please help.