In a geometric sequence, a2=2, a3=16, and a4=128. Which equation can be used to find the nth term of the sequence, an?

an=8⋅2n−1

an=2n−1

an=14⋅8n−1

an=2⋅14n−1

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.