14. Which one quadratic equation has only one solution. A. x² + 3x +11 =0 B.x²-3x-1=0 C. x² -2x +1 =0 D. x² +x +7 =0 15.which one system of linear equation has no solution set. -x +4y =7 D. all A. 3x-4y =5 6x +9y =7 B. 2x +3y =3 (2x +3y=13 C. 60 √20/45 16.The simplest form of 17. The rationalizing factor for is √3 18. The solution set of 8x -4y =6 is 2x -y =4 (2x-3y = -14 √3 A. 3 B2 C. B2/3 2/3 60 4/5 x 45 وله √9 A. many solution B. (2-4) C. (-42) D. no solution 19. If U={1,2,3,... 10), A=(1,3,5,7) and B=(1,2,3,4) then U/AAB is___ D. 4​