A rancher has a pen show on the grid, where 1 unit represents 1 meter. The rancher needs a larger pen to be a dilation of the smaller pen by a scale factor of 3.5 with the origin as the center of dilation

A. The center of the circle is the midpoint of the given endpoints. That is,
                             x-coordinate = (-7 + 3) / 2 = -2
                             y-coordinate = (-10 + 2) = -4
The coordinates are (-2,-4)

B. The radius of the circle is the distance between the center and one of the points. 
                                r = sqrt ((-10 - -2)^2 + ( -7 - -4)^2) = sqrt of 73

C. The equation of the circle is written through the equation,
                                    (x - -2)^2 + (y - -4)^2 = (sqrt of 73)^2