For 12 , and explain to me how you get the answer as well so i at least know what i am doing. xd

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

Asinusoidal function whose frequency is 1/6pi

Melody received $140 at the end of a certain week. how many customers did she advise that week?