I would be guessing that since the square is 4ft squared I would imagine that it would have 2ft per side. That would mean 24inches per side. 24×4= 96inches. 96 tiles is what she needs. I am a little confused myself, hope this helps
The graph will be discrete because there is no such thing as a partial person to sign up and the booth is set up once each day for sign ups. So the last answer choice is the right one