Answer:
if she rides the slides 6 times, the costs will be the same: $31
Explanation:
You can write an equation in order to solve this problem. Since you are trying to find how many trips using the (3t + 13) plan are equal to the plan that costs 31, the equation would be:
31 = 3t + 13
= 18 = 3t
= 6 = t
(3t + 13 stands for $3 a trip plus $13 entry fee)
This means that if Carla takes 6 trips using either plan, they will cost the same; both would cost $31.