Plz..urgent answer homework..can yuh try plzz its math

What is created when solids,liquids,an gases mix with one another

Which changes of state do the labels represent? a: b: c:

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?