Plz this is the only question i am stuck on.

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.

Cate purchases $1600 worth of stock and her broker estimates it will increase in value by 4.2% each year. after about how many years will the value of cate's stock be about $2000

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.