A teacher plans a field trip to meet with and hear a holocaust survivor tell about their experience during that time period. The cost of the tickets are $10 each, plus a $5 administration fee for ordering them online. Which equation shows the relationship between the number of tickets (t) the teacher needs to order and the total cost (c) for the class to attend the event if the tickets are ordered online?
A)t = 10c + 5
B)c = 5t + 10
C)c = 10t + 5
D)10 = 5t + c
I think the answer is c (c=10t +5) ,but I 'm not sure .