What is the radius of the inner circle

What is the size of the matrix resulting from

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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.)