To determine Connor's total cost for a movie ticket, we need to consider the ticket price \( t \) and any additional costs, such as tax. If we assume the tax is 15% of the ticket price, we can express this as:
- The ticket price is \( t \).
- The tax would be \( t \times 0.15 \).
Thus, the total cost \( C \) in terms of \( t \) would be:
\[ C = t + (t \times 0.15) = t + 0.15t \]
Therefore, the correct expression for his total cost is:
t + 0.15.