Plz help me... it would help if u did all the questions :)

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?