I have what I think is right; but want to know if my calculations agree.
Students in an English class took a final exam. They took equivalent forms of the exam at monthly inervals thereafter. The average score S(t ), percent, after t months was found to be given by S(t )=68 -20 log (t + 1), t ≥ 0
a. What was the average score when they initially took the test, t = 0? (show work so I can see if same answer)
b. What was the average score after 14 months? (show work to see if I'm still on the right track)
c. After what time t was the average score 40%? (show work to see if we agree) Thank you!