Find the perimeter of an isosceles triangle with the side lengths of 5+x, 5+x, and xy. write in simplest form.

What is always true about a positive integer raised to a negative odd power?

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.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?