To model the situation with an equation, we can let \( C \) represent the total cost, and \( t \) represent the number of students and teachers attending. The cost of the bus rental is a fixed cost of $500, and the cost of tickets per person is $20. The equation that models this situation is:
\[ C = 500 + 20t \]
Now, let's calculate the total cost when \( t = 60 \) (for 60 students and teachers):
\[ C = 500 + 20(60) \] \[ C = 500 + 1200 \] \[ C = 1700 \]
So, the total cost for the event is $1,700.
The correct response would be: C = 500 + 20t; $1,700.