50 points to who answers all of ! 1. the equation of a circle is x2+y2+10x−4y−20=0 . what is the radius of the circle? 2. the general form of the equation of a circle is x2+y2+2x−6y+1=0. what are the coordinates of the center of the circle? 3.the standard form of the equation of a circle is (x−3)2+(y−1)2=16. what is the general form of the equation? 4. the center of a circle is located at (5, −5) . the radius of the circle is 3. what is the equation of the circle in general form? 5. what is the equation of this circle in general form?