How to you solve these problems?

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

Find the solutions for a triangle with a =16, c =12, and b = 63º

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?