An outdoor swimming pool costs $8 per day to visit during the summer. There is also a $25 yearly registration fee. Is the total cost proportional to the total number of days visited?

1 Answer
Mar 9, 2017

No

Explanation:

The equation of cost includes the flat fee. This fees makes it so the cost is not proportional to the number of days visited.

#"Cost" = 25 + 8d#

To be proportional you'd have to have no flat fee: #"cost" = 8d#

1 day = $8
2 days = $16
5 days = $40
10 days = $80, etc.