BENJAMIN949202 BENJAMIN949202 27-11-2022 Mathématiques Answered A = 3t+ (2t² +9)-(-9t+t²). B = x - (11-x²)+(12x-3). C = -2y2-(3y-6y2) + (-5y+9) D = 7z+ (5z2 - 5z)-(2z-3).