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!