Answer:
The first option.
Explanation:
Warm solvent and stirring promote quick dissolving . Also with small crystals more of the surface is in contact with the solvent than with large crystals.
Answer: 
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
Precipitation is a type of displacement reaction in which one the products is formed in the solid state.

Answer:
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
Explanation:
1.
cost in cents
cost = 5m
2.
miles = c + 2