If a new mustang is valued at 20,000 and five years later it is valued at 8000, then what is the average rate of change of its value during those five years?

Quadrilateral ghij has coordinates g(5, 1), h(4, -3), i(6, -1), and j(2, 1). if the quadrilateral is reflected over the line y = x, what are the coordinates of h'?