Letter d is 72 can someone answer this question

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^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.)

Which of the following expressions is equal to 2x^2+8