Someone please help im gonna fail

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show