Use the given sets to find X n (Y U Z). U = {a, b, c, d,...,x, y,z}
X = {n, u, m, b, e, r}
Y = {b, r, e, a, t, h}
Z = {I, a, u, g, h, t, e, r}

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.