Convert the equation to the standard form for a parabola by completing the square on x or y as appropriate. 10) x2 + 2x - 10y + 31 =0 10 A) (x + 1)2 = 10(y - 3) B) (x + 1)2= 10(y +3) C) (x - 1)2 =-10(y - 3) D) (x - 1)2 = 10(y - 3) Find the vertex, focus, and directrix of the parabola with the given equation. 11) (x - 4)2 =20(y + 3) 11) A) vertex: (-3, 4) B) vertex: (-4, 3) C) vertex: (4, -3) D) vertex: (4, -3) focus: (-3,9) focus: (-4, 8) focus: (4, -8) focus: (4, 2) directrix: y =-1 directrix: y =-2 directrix: x = 2 directrix: y = -8 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Identify the equation without completing the square. 12) 5x2 - 6y2 + 2x - 3y - 5=0 12) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Write the equation in terms of a rotated x'y'-system using 0, the angle of rotation. Write the equation involving x' in standard form. 13 13) xy +16 = 0; 0 = 450 Cy'2 x 12 y'2 X'2 A) B) y'2 =-32x' D) 4 + = 1 32 32 32 32 best completes each statement or answers the