What are these numbers from greatest to least: 7.4, 6.55, -2.47, -18.33, -6.111, 7.66, 2.99, -18.9

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

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.

Can someone show me step by step how to do this?