If a=x/1-x, which of the following represents x in terms of a ?

a
a/a-1
a/1-a

This is so hard and it’s for a test

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

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.