Which equation represent a circle with a center at (2,-7) and a radius of 4 units ?

If square root x = -7, then x= -49 true or false

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?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11