Who wants to join my zo__om

Me find the missing dimension of a triangle height: 7 in., area: 21^2

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.)

Hurry which expression is equivalent to 3√x^5y?