What is the solution to the equation ? n = −1 n = 2 n = 5/3 n = 5/2

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 describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

2x minus y equals 6, x plus y equals negative 3