What is 12 more than 8.2 times a number n

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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.

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?