Needing sum help pretty confused

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

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.