Question

which is true of $100\\ \text{cm}^3$ of feathers and $100\\ \text{cm}^3$ of bricks? the feathers are less dense
please choose the reasoning for your answer:
they have the same density because the mass and volume are the same
they have the same density because the mass is the same
they have the same density because the mass and volume are the same
the feathers are less dense because the mass is less
the feathers are more dense because the mass is greater

Explanation:

Density is defined by the formula $
ho = \frac{m}{V}$, where $
ho$ is density, $m$ is mass, and $V$ is volume. Both the feathers and bricks have the same volume ($100\ \text{cm}^3$), but a given volume of feathers has a much smaller mass than the same volume of bricks. A smaller mass with equal volume results in lower density for the feathers.

Answer:

The feathers are less dense
The feathers are less dense because the mass is less