Figure out how far these planets are from earth, and yes please do the first two questions too. It's science so no need to explain

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;

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

The base of a triangle is 8 1 3 meters and the height of the triangle is the fourth root of 16 meters meters. what is the area of the triangle?