Evaluate f-g+(-2) where f = -3.005 and g = 4.7

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;

Which of the following can be used to explain a statement in a geometric proof?

Find the solution(s) to x^2-14+49=0