u/Efficient-Studio6470

Hello,
I am going crazy with this assignment. I feel like I have tried every possible outcome and nothing is working. My interpretation is that we are talking about "past".
I have tried:
9-14, 9-15, 8-14, 8-15, 1-7, 1-15, 22-28
What am I doing wrong here. Would this not be the last week 9-15 or 8-14 ?
no asking for answer, just need to know If I am misinterpreting the sign for this. Ive been at this for 2 hours on the same question.