Answer: Cluster 3 (D)
Explanation: Cluster 3 is the oldest and it could be the source from which cluster 2 and 3 got their spectral type from.
C. zinc is best used for making screws. Zinc is best used for making alloys, anything made from 55% or 95% copper more then likely contain zinc
Answer : 
Explanation :
It is given that,
Charge, 
Velocity of Aircraft,
(in west)
Magnetic field,
( in north )
Using the relation as :

Magnetic force is ,


Using Right hand thumb rule, the direction of force is in the plane perpendicular to the velocity and the magnetic field i.e.
.
Answer:
What inferences can you make about the melting points of the different substances and the motion of their particles, based on the data? (ignore that needed it here so i could see it better.)
Explanation:
Butter has a lower melting point than the cheese and the wax. The motion of the cheese were a little separated while the butter articles have more space in between. The wax had the closest particles.
I dont know if that makes sense?