What is the 100th digit to the right of the decimal point in the decimal representation of $\frac{13}{90}$?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

What is negative 3/9 times negative 2/8 ?

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.