If u could answer it or explain how to do it I’ll appreciate it v much

D. 0m

Explanation:

D.) 0 m

Explanation:

Think of it like a graph. The helicopter starts at 0 m.

So, this is how you solve it.

Think of going up as adding, and going down as subtracting.

The displacement of the helicopter is 0 m.

the answer is barium and copper bromide

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.