Find the correct answers for (A,B), (C), (D), (E), (F) and (G)

On the plane xy, there are a parabola y=x^2+x-2 ... (a) and a straight line y = 3x+a ... (b)

(1) The xy cordinates of the vertex of (a) are (A,B)

When (a) and (b) have common points, then a ≥ (C)

(2) If a = 1, then the x coordinates of the intersection of (a) and (b) are (D) and (E) , and the area (area S) which is surroundedby (a) and (b) is (F) . When a circle with radius r (x^2+y^2 = r^2) is includd by area S, then 0<r< (G)