What is the center of the circle described by the equation: x2 − 6x + y2 + 2y + 1= 0

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Classify the following triangle check all that apply

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?