Please help! I will mark as brainliest IF answer is right. <3

Which of the following is the true for f(x) = 5cos

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.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?