A family of 4 went to an amusement park. They bought their tickets online. At the park, they spent $109.99 throughout the day for food and souvenirs. The total cost of the trip, including the tickets, was $347.95. Write an equation that represents the total cost.

Let x be the cost of the tickets.

Since the family spent $109.99 throughout the day for food and souvenirs, the cost of the tickets and the additional expenses is equal to 109.99 + x.
Since the total cost of the trip, including the tickets, was $347.95, the equation that represents the total cost is x + 109.99 = 347.95.