I need help with number 3

How many days was the temperature above 90 degrees?

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.

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons