Izzi's Pizza wants to offer at least 15 options for ordering 2 vegetable topping pizzas. What is the minimum
number of vegetable topping choices they need to offer?

6 vegetable topping choices.

Step-by-step explanation:

If we have two toppings out of X, the number of possible combinations is:

and we want that c ≥ 15

We can do it by brute force:

Let's select x = 5 for example:

So with 5 vegetable toppings we have not enough, let's see with 6.

So with 6 options we have exactly 15 different combinations, the correct answer is 6.

step-by-step explanation:

combine all like terms then its just a 2 step equation