Plzzz i don't really. know this

Use set buikder notation to represent the following set: {, -2, -1, 0}

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.)

What is the lcm of 16 and 40 ? 24 and 40 ?