A deli offers a choice of 3 breads, 4 meats, and 7 toppings. Using these ingredients, how many possible sandwich combinations are there?

So what you can do is:

3 breads * 4 meats * 7 toppings

Because there are four meats per each of the three breads and 7 toppings for each type of bread and meat combo.

so,

3 * 4 * 7

12 * 7

84

There are 84 sandwich combos.