Find the equation of the line shown

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

What is the range for 31,39,29,34,37,24,36,33,34,28

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).