Final answer:
Kaitlyn spent $178.75 on all the movie tickets for herself and her 12 family members.
Step-by-step explanation:
To find out how much Kaitlyn spent on all the movie tickets, we need to multiply the cost of one ticket by the number of tickets she bought. Kaitlyn bought tickets for herself and 12 family members, so there are a total of 13 people. Each ticket costs $13.75, so the total amount spent is 13 x $13.75 = $178.75.