Answer:The density of a substance is defined as its mass per unit volume. So we can calculate the density of silver using the given values:
density = mass / volume
Substituting the given values, we get:
density = 21 g / 2 cm^3
Simplifying, we get:
density = 10.5 g/cm^3
Therefore, the density of the piece of silver is 10.5 g/cm^3, which is option D.
Step-by-step explanation: