Ellen likes to draw pentagons and hexagons. her paper has a total of 39 sides. if there are four hexagons, how many pentagons are there?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Which two undefined geometric terms always describe figures with no beginning or end?

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.