I found the same answer on
g.o.o.g.l.e
What are the exact numbers
What is the problem what am I supposed to do?
I can't tell you the answer without a picture, but to find the answer yourself: Go straight up from the cell containing 'Activity Questions' this will tell you a letter such as B. Go directly across to the left of the cell containing 'Activity Questions' this will tell you a number such as 3. The name of the cell I used as an example would be called B3.