Answer:
The answer is 3 which is 4.50 + 0.79r ≤ 16.00; 14 rides
Explanation:
The entrance fee of the carnival is 4.50$. That amount need to be paid only once. Each ride will cost 79 cents. The total amount of cost comes from ride will be calculated by multiplication of 79 cent and r number. Therefore equation will be:

And the maximum rides he can go on will be:

r can be 14 at maximum.