Which statement is sometimes, but not always, true?
a.
a parallelogram is a rhombus.
b.
a rhombus is a quadrilateral.
c.
a trapezoid is a square.
d.
a square is a rectangle.

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.