to find the number of polygons hat can be formed from 7 points on a plane with no three of which are collinear, rossel answer

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).