Ax + b = c for x. is what I want to know

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

Mary works for a company that ships packages and must measure the size of each box that needs to be shipped. mary measures a box and finds the length is 7 inches, the width is 14 inches, and the height is 15 inches. what is the volume of the box? [type your answer as a number.]

Percent increase and decrease. original number: 45 new number: 18