Based on the provided information about tickets sold and money earned, let's fill in the response areas:
a. Every ticket sold is 12 dollars earned. (This is found by dividing total money earned by total tickets sold).
b. Dollars/1 ticket is called a unit rate.
c. This relationship is non proportional, because 0 tickets sold is 0 dollars earned (the earnings do start at 0 when no tickets are sold, but the amounts earned do not maintain a consistent ratio for every increment of tickets sold).
So the complete answers are:
a. 12
b. unit rate
c. non proportional; 0; 0