Tracey bought a diamond ring appraised at$ 1600 at an antique store. if diamonds have appreciated in value at an annual rate of 10%, what was the value of the ring 10 years ago?

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.