Which sum or difference is modeled by the algebra tiles? A. (-x^2+2x+3)-(x^2-2x-1)=-2x^2+2
B. (-x^2+2x+3)-(-x^2+2x+1)=-2x^2+2
C. (-x^2+2x+3)+(-x^2+2x+1)=-2x^2+2
D. (-x^2+2x+3)+(-x^2-2x-1)=-2x^2+2

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.