Final answer:
The cost of each topping is found by subtracting the base price of the pizza from the total cost and dividing by the number of toppings. Each topping costs $1.
Step-by-step explanation:
The question asks about the cost of toppings on a pizza. Joe paid $6 for the pizza and an additional $3 for three toppings, making the total cost $9.
To find the cost of each topping, we need to subtract the cost of the pizza without toppings from the total cost and then divide by the number of toppings.
To calculate: Total cost of pizza with toppings ($9) - Cost of pizza without toppings ($6) = Cost of all toppings ($3). Then divide the cost of all toppings by the number of toppings. Hence, $3 divided by 3 toppings equals $1. Therefore, the cost of each topping is $1.