Find the radius of the circle containing 20 degree arc of a circle whose length is 15 pi meters

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.)

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)