PLEASE HELP!! I’m really confused one how to calculate for all the sides

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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.)

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)