Problem
Suppose that $C(s)$ represents the cost in dollars of buying a pizza with $s$ number of toppings. Which statement best reflects what $C^{-1}(10)$ represents? The delivery charge to purchase a pizza with 10 toppings. The cost of ordering a pizza with 10 toppings. One over the cost to purchase a pizza with 10 toppings. The number of toppings on a pizza that can be purchased with $\$ 10$. The cost of 10 pizzas.
Solution
Step 1 ：Suppose that $C(s)$ represents the cost in dollars of buying a pizza with $s$ number of toppings.
Step 2 ：Consider what $C^{-1}(10)$ represents.
Step 3 ：The statement that best reflects what $C^{-1}(10)$ represents is 'The number of toppings on a pizza that can be purchased with $\$ 10$.'
Step 4 ：\(\boxed{\text{'The number of toppings on a pizza that can be purchased with $\$ 10$.'}}\)
