If a store advertised a sale that gave customers a 1/4 discount, what is the fractional part of the original price that the customer will pay?

Which representation has a constant of variation of -2.5

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.

Solve 17= -13 - 8x and show your work.