Tickets are being sold for a new play at a local theatre. the table shows the number of tickets that were sold on each of the first five days.
day
1 2 3
4
5
tickets sold per day 3 12 27 48 75
what is the average increase in the number of tickets sold per day, from day 1 to day 5?
o a 9 additional tickets per day
ob. 15 additional tickets per day
c. 18 additional tickets per day
o d. 21 additional tickets per day
o e. 33 additional tickets per day