For a non-resident:

For a resident:

We want to know the number of days
such that the two costs are equal ie 
To do this set the two costs equal to each other:


And solve for d:




The costs will be equal when a resident and a non-resident each use the beach for 12 days.
Cos(7)=5.1/x
X=5.1/cos(7)
X=5.1/0.99
X=5.15
The length is 5.15 ft
See the table below for the missing values.
Answer:
1\3
Step-by-step explanation: