Please. I need. help

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.)

Two numbers have a sum of -19. one number is x. what expression represents the other number?

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.